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Wyświetlanie 1-15 z 21
Tytuł:
Scanning Tunneling Spectroscopy Study of Surface States of 3d Metals: Chemical Identification, Magnetic Contrast and Orbital Kondo Resonance States
Autorzy:
Bischoff, M. M. J.
Fang, C. M.
de Groot, R. A.
Heijnen, G. M. M.
Katsnelson, M. I.
Kolesnychenko, O. Yu.
de Kort, R.
Lichtenstein, A. I.
Quinn, A. J.
Vasquez de Parma, A. L.
Yamada, T. K.
van Kempen, H.
Powiązania:
https://bibliotekanauki.pl/articles/2036891.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.-r
68.37.-d
75.70.-i
Opis:
The surface states of 3d transition metals are studied by scanning tunneling microscopy and scanning tunneling spectroscopy. The results show that surface states can be used for chemical identification with high spatial resolution. The spin polarized nature of the surface states allows us to obtain magnetic contrast in scanning tunneling miroscopy imaging with near atomic resolution. For Cr(100) we found that the surface state close to the Fermi level can be explained by an orbital Kondo resonance surface state.
Źródło:
Acta Physica Polonica A; 2003, 104, 3-4; 231-243
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrodeposition and Characterization of Co/Cu Multilayers
Autorzy:
Haciismailoglu, M.
Alper, M.
Kockar, H.
Karaagac, O.
Powiązania:
https://bibliotekanauki.pl/articles/1398770.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.47.De
75.50.Cc
75.70.Cn
Opis:
Co/Cu multilayers having different bilayer number (total thickness) were electrodeposited on polycrystalline Cu substrates with a strong [100] texture from an electrolyte including Co and Cu ions under potentiostatic control. The structural data from X-ray diffraction (XRD) revealed that all films have face-centered cubic (fcc) structure, but their crystal textures change from [100] to [111] as the bilayer number increases. The magnetic analysis by vibrating sample magnetometer (VSM) showed that the magnetic moment per volume decreases as the bilayer number increases. Magnetoresistance (MR) measurements were made at room temperature in the magnetic fields of ± 12 kOe using the Van der Pauw (VDP) method with four probes. The samples with the bilayer number less than 111 exhibited giant magnetoresistance (GMR) with a negligible amount of anisotropic magnetoresistance (AMR), while the ones with the bilayer number larger than 111 have pure GMR effect.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 773-775
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fermi-Edge Singularity in Excitonic Spectra of Modulation Doped AlGaAs/GaAs Quantum Wells
Autorzy:
Bugajski, M.
Regiński, K.
Godlewski, M.
Wesołowski, M.
Holtz, P. O.
Buyanov, A. V.
Monemar, B.
Powiązania:
https://bibliotekanauki.pl/articles/1950741.pdf
Data publikacji:
1996-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.35.+z
85.30.De
Opis:
The dynamic response of an electron Fermi sea to the presence of optically generated holes gives rise to an enhanced interaction of correlated electron-hole pairs near the Fermi level, resulting in an enhanced oscillator strength for optical transitions, referred to as the Fermi-edge singularity. We studied this effect in modulation-doped quantum wells which provide confined dense Fermi sea, spatially separated from dopant atoms, easily accessible for investigations under low excitation conditions. The Fermi-edge singularity was observed in both photoluminescence and photoluminescence excitation experiments, although in the case of photoluminescence the samples had to be either co-doped with acceptors in the wells to provide necessary localization of holes or designed to allow for nearly resonant scattering between the electronic states near the Fermi energy and the next unoccupied subband of the 2D electron gas.
Źródło:
Acta Physica Polonica A; 1996, 90, 4; 751-754
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Local Magnetic and Electronic Properties of the A$\text{}_{2}$FeM'O$\text{}_{6}$ (A = Ba, Sr, Ca, M' = Mo, Re) Double Perovskites
Autorzy:
Zając, D.
Sikora, M.
Prochazka, V.
Borowiec, M.
Stępień, J.
Kapusta, Cz.
Riedi, P. C.
Marquina, C.
De Teresa, J. M.
Ibarra, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/2047344.pdf
Data publikacji:
2007-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.-m
76.60.-k
76.60.Jx
78.80.En
Opis:
The results of a combined NMR, X-ray absorption spectroscopy and X-ray magnetic cirrcular dichroism study of the AA'FeMoO$\text{}_{6}$ and AA'FeReO$\text{}_{6}$ double perovskites are presented. They revealed a dependence of electronic and magnetic properties, including a d-electron transfer between Fe and Mo sites, on the structural tolerance factor. The maximum value of the 4d Mo electron occupation and the corresponding Mo moment is obtained for the tolerance factor of unity. This corresponds to the maximum strength of the magnetic interaction and, respectively, to the Curie temperature. The dominant T$\text{}^{5}\text{}^{/}\text{}^{2}$ type temperature dependence of the Mo hyperfine field reveals the half-metallicity of the AA'FeMoO$\text{}_{6}$ compounds. Antisite defects and antiphase boundaries have been identified in NMR measurements and the strength of their magnetic coupling have been determined. A considerable orbital contribution to the Re and Fe magnetic moments were found in the NMR and X-MCD measurements on the AA'FeReO$\text{}_{6}$ compounds. Its magnitude decreases with increasing structural tolerance factor and is correlated with their magnetic anisotropy.
Źródło:
Acta Physica Polonica A; 2007, 111, 6; 797-820
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A $\text{}^{55}$Mn NMR Study of La$\text{}_{0.33}$Nd$\text{}_{0.33}$Ca$\text{}_{0.34}$Mn O$\text{}_{3}$ with $\text{}^{16}$O and $\text{}^{18}$O
Autorzy:
Rybicki, D.
Kapusta, Cz.
Riedi, P. C.
Oates, C. J.
Sikora, M.
Zając, D.
De Teresa, J. M.
Marquina, C.
Ibarra, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/2037128.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.60.-k
75.47.Gk
Opis:
A $\text{}^{55}$Mn NMR study of $\text{}^{16}$O and $\text{}^{18}$O containing La$\text{}_{0.33}$Nd$\text{}_{0.33}$Ca$\text{}_{0.34}$Mn O$\text{}_{3}$ is reported. The spin-echo spectra measured at 4.2 K and zero field consist of a double exchange line corresponding to the ferromagnetic metallic regions. The line intensity is more than an order of magnitude lower for the $\text{}^{18}$O compound, which indicates an order of magnitude lower content of the ferromagnetic metallic phase in this compound. The frequency dependence of the spin-spin relaxation time T$\text{}_{2}$ shows a pronounced minimum at the center of the double exchange line of both compounds due to the Suhl-Nakamura interaction, which indicates that the ferromagnetic metallic regions are at least 10~nm in size. The results are discussed in terms of the influence of oxygen isotopic substitution on phase segregation.
Źródło:
Acta Physica Polonica A; 2004, 105, 1-2; 183-188
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving the Surface Properties of Cp-Ti by Pulsed Electro-Spark Deposition
Autorzy:
Yılmaz, M.
Atar, E.
Şahin, O.
Kayalı, E.
Powiązania:
https://bibliotekanauki.pl/articles/1293045.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.47.De
61.82.Bg
Opis:
Al-Ti intermetallic compounds were coated by electro-spark deposition. Commercially pure titanium (Cp-Ti) (grade 2) and aluminum rods were used as substrate and electrode materials, respectively. During the electro-spark deposition experiments the following pulse parameters in a group were used: pulse current amplitude, pulse duration and pause between the pulses of a pulse group with 100-300-500 A, 50-100 μs, and 100 μs, respectively. Al-Ti coatings having a thickness range of 15-30 μm were formed on the surface of titanium substrate using electro-spark deposition process. The coating properties such as the roughness and the thickness increased with increasing pulse duration and pulse current amplitude. The mass transfer coefficient decreased with increasing pulse current amplitude and pulse duration. The quality of the adhesion characters of the coatings, determined by Rockwell-C adhesion test, becomes worse from HF-2 to HF-4, due to increase of pulse current amplitude. Depending on the electro-spark deposition process parameters, the coating formed as AlTi or as layered structure consisting of AlTi+$AlTi_3$ when pulse current amplitude increases. The Al-Ti coatings include some micro cracks lying throughout the coating from surface to interface which is nature of this process. The maximum cross-sectional hardness of the coatings were in the range of 800-1150 HV.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 593-596
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Giant Magnetoresistance and Shubnikov-de Haas Effect in LuSb
Autorzy:
Kleinert, M.
Pavlosiuk, O.
Swatek, P.
Kaczorowski, D.
Wiśniewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1030528.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Eh
71.55.Ak
72.15.Eb
Opis:
Single-crystals of LuSb were investigated by means of electrical resistivity and magnetoresistance measurements. The compound was found to exhibit giant magnetoresistance exceeding 3000%, low-temperature resistivity plateau, and Shubnikov-de Haas oscillations. It was characterized as a semimetal with nearly balanced contributions of electron and hole carriers to the magnetotransport properties. The experimental findings, supported by the results of electronic structure calculations, proved that the magnetotransport in LuSb can be described in the scope of 3D multi-band Fermi surface model without topologically non-trivial electronic states.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 538-540
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electroluminescence Investigation of the Lateral Field Distribution in AlGaN/GaN HEMTs for Power Applications
Autorzy:
Baeumler, M.
Polyakov, V.
Gütle, F.
Dammann, M.
Benkhelifa, F.
Waltereit, P.
Reiner, R.
Müller, S.
Wespel, M.
Quay, R.
Mikulla, M.
Wagner, J.
Ambacher, O.
Powiązania:
https://bibliotekanauki.pl/articles/1197910.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.60.Fi
85.30.De
85.30.Tv
85.40.Bh
85.40.Qx
73.40.-c
73.90.+f
73.61.Ey
73.50.Mx
Opis:
The lifetime and stability of AlGaN/GaN heterostructure field effect transistors at high power levels can be enhanced by introducing field plates to reduce electric field peaks in the gate-drain region. Simulations of the electric field distribution along the channel using the 2D ATLAS software from Silvaco indicate that above a characteristic drain source voltage three spatially separated electric field peaks appear, one located at the drain-side edge of the gate foot, one at the end of the drain-sided gate field plate, and one at the end of the source shield field plate. The close correlation between lateral electric field and the electroluminescence due to hot electron related intra-band transitions can be very helpful when optimizing the electric field distribution in high power devices. Electroluminescence microscopy images of devices with gate and source shield field plate reveal the peaks located at the locations of enhanced electric field. By studying the voltage dependence of the electroluminescence peaks the influence of the field plates on the electric field distribution in source drain direction can be visualized.
Źródło:
Acta Physica Polonica A; 2014, 125, 4; 982-985
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
NMR Study of (Sr,Ba,La)$\text{}_{2}$Fe$\text{}_{1+y}$Mo$\text{}_{1-y}$O$\text{}_{6}$ Double Perovskites
Autorzy:
Zając, D.
Kapusta, Cz.
Riedi, P. C.
Sikora, M.
Oates, C. J.
Rybicki, D.
De Teresa, J. M.
Serrate, D.
Marquina, C.
Ibarra, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/2041522.pdf
Data publikacji:
2004-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.25.+z
76.60.-k
78.70.Gq
75.47.Gk
Opis:
The $\text{}^{95}$Mo and $\text{}^{97}$Mo NMR spin-echo study of (Sr,Ba,La)$\text{}_{2}$Fe$\text{}_{1 +y}$Mo$\text{}_{1-y}$O$\text{}_{6}$ double perovskites is reported. Powder samples of Ba$\text{}_{1.44}$Sr$\text{}_{0.36}$La$\text{}_{0.2}$FeMoO$\text{}_{6}$ and (Ba$\text{}_{0.8}$Sr$\text{}_{0.2}$)$\text{}_{2-2x}$La$\text{}_{x}$#$\text{}_{x}$ Fe$\text{}_{1+y}$Mo$\text{}_{1-y}$O$\text{}_{6}$, where# denotes vacancies, for: x=0, y=0; x=0.1, x=0.2 and x=0.3, y=0 and y=0.2 were measured at 4.2 K and no applied magnetic field. NMR signals are observed at 55-100 MHz for the main line and 30-55 MHz for low-frequency satellite. The main line and the satellite are attributed to the ideal and defect positions of Mo atoms. La and vacancy doping introduce more defects, however, increasing the Fe/Mo ratio decreases the amount of defect Mo sites. La doping causes a satellite pattern at the high frequency side of the spectrum, which is related to different numbers of the La next neighbours. The effect is attributed to an increase in the electron density and the corresponding magnetic moment at the adjacent Mo sites and reveals a local character of the electron doping.
Źródło:
Acta Physica Polonica A; 2004, 106, 5; 759-765
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics and Electrochemical Performance of $TiO_2$:MWCNT Nanocomposite Anodes for Li-Ion Batteries
Autorzy:
Guler, M.
Cetinkaya, T.
Cevher, O.
Tocoglu, U.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1218684.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.45.Mp
61.48.De
Opis:
In this study, highly porous buckypapers were manufactured via vacuum filtration techniques and nanocrystalline $TiO_2$ thin films were deposited on buckypapers using reactive radio frequency magnetron sputtering to understand the role of the deposition power. In addition, the effects of the deposition parameters on the electrochemical properties as an anode electrode for Li-ion batteries have also been studied.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 322-324
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel Titanium Dioxide Based Nanocomposite Anodes for Li-Ion Batteries
Autorzy:
Oguz Guler, M.
Cevher, O.
Tocoglu, U.
Cetinkaya, T.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1399946.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.48.De
82.45.Mp
82.47.-a
Opis:
Carbon nanotube thin sheets - buckypapers - were prepared from multi-walled carbon nanotubes oxidized with different oxidation agents. Titanium dioxide films were then deposited by thermal evaporation of Ti films on buckypapers substrates followed by in situ dc plasma oxidation. The effect of oxidation power on the structural, compositional and electrochemical properties of the films was investigated.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 390-392
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic Conductivity of Electrons and Electron-Phonon Interaction in Open Three-Well Nanostructures
Autorzy:
Tkach, M.
Seti, Ju.
Grynyshyn, Y.
Voitsekhivska, O.
Powiązania:
https://bibliotekanauki.pl/articles/1401886.pdf
Data publikacji:
2015-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.20.Kd
78.67.De
72.10.Di
Opis:
The theoretical description of electronic tunneling transport through the three-well nanostructure $(In_{0.53}Ga_{0.47}As/In_{0.52}Al_{0.48}As)$, being an expanded active region of quantum cascade detector, is presented. Using the solution of the Schrödinger equation, the dynamic conductivity caused by quantum transitions due to the interaction of electrons with electromagnetic field and phonons is calculated. Within the Green functions approach, the electron spectrum, renormalized due to the interaction with confined optical and interface phonons is obtained at cryogenic and room temperatures. The role of different mechanisms of electron-phonon interaction in the formation of temperature shifts, decay rates of electron states and electromagnetic field absorption bands is investigated. It is shown that independently of the temperature, the contribution produced by interface phonons into renormalized electron spectrum is several times bigger than that of confined phonons. However, the experimentally observed long-wave shift and broadening of absorption band at higher temperatures is, mainly, caused by the decreasing heights of resonant tunneling structure potential barriers.
Źródło:
Acta Physica Polonica A; 2015, 128, 3; 343-352
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of Antimony Doped Tin Oxide Nanocomposites for Li-Ion Batteries
Autorzy:
Guler, M.
Cevher, O.
Tocoglu, U.
Cetinkaya, T.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1399942.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.48.De
82.45.Mp
82.47.-a
Opis:
High content carbon nanotubes mats have been produced to multi-walled carbon nanotubes. Sb doped $SnO_2$ films were then deposited by rf magnetron sputtering on buckypapers substrates. The effect of oxidation pressure on the structural, compositional, and electrochemical properties of the films was investigated.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 383-385
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Lattice Parameters Variation of $CaCu_xMn_{7-x}O_{12}$ Compounds with Trigonal Crystal Structure
Autorzy:
Sławiński, W.
Przeniosło, R.
Sosnowska, I.
Bieringer, M.
Margiolaki, I.
Powiązania:
https://bibliotekanauki.pl/articles/1813179.pdf
Data publikacji:
2008-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.C-
65.40.De
Opis:
We report the crystal structure evolution of $CaCu_{0.2}Mn_{6.8}O_{12}$ as a function of temperature between 10 K and 290 K. The analysis of the diffraction data is carried out with the Rietveld method applied to the average trigonal structure of $CaCu_{0.2}Mn_{6.8}O_{12}$. The x = 0.2 member shows similar low temperature extrema for the unit cell parameter evolution as the previously reported x = 0.1 and x = 0 members of the $CaCu_xMn_{7-x}O_{12}$ system. All magnetic and crystallographic transition temperatures indicated by the unit cell parameter evolution obtained by powder X-ray diffraction methods systematically decrease with increasing Cu content, x.
Źródło:
Acta Physica Polonica A; 2008, 113, 4; 1225-1230
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation of Fine-Grained Silicon-Nitride Ceramics and their Characterization by Depth-Sensing Indentation Tests
Autorzy:
Şahin, O.
Güder, H.
Uzun, O.
Şahin, E.
Sopicka-Lizer, M.
Göçmez, H.
Artunc, E.
Powiązania:
https://bibliotekanauki.pl/articles/1402391.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.-x
62.20.de
81.05.Je
Opis:
Both pressureless-sintered and dense, fine-grained silicon nitride ceramics were produced from mechanochemically activated nitride-based precursors. Scanning Electron Microscopy (SEM), Transmition Electron Microscopy (TEM), X-Ray Diffraction (XRD) and an ultra-low load microhardness tester were used to characterize these ceramics. Depth-sensing indentation (DSI) tests in the range of 200-1800 mN were performed on the silicon nitride ceramic to determine dynamic hardness (H_d) and reduced elastic modulus (E_r) values. These values were deduced by analyzing the unloading segments of the DSI curves. It was found that both H_d and E_r exhibits a significant indentation load dependence. Nix-Gao (NG) model was used to analyze the dynamic hardness data in the calculation of the load independent hardness value.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-355-B-359
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 21

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