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Wyświetlanie 1-15 z 16
Tytuł:
Electronic Structure of Ternary Antimonides YbPdSb
Autorzy:
Hermanowicz, M.
Jezierski, A.
Kaczkowski, J.
Kaczorowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/1810476.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
71.15.Ap
71.15.Mb
71.20.Eh
71.20.Lp
Opis:
In this paper we present the electronic structure and magnetic properties of YbPdSb in low-temperature MgAsAg-type structure and high-temperature TiNiSi-type structure. The calculations were performed by ab initio full-relativistic full potential local orbital method within the local spin density approximation. Ab initio calculations showed the metallic character of YbPdSb compound in both structures. The density of states at the Fermi level is greater in high-temperature than in low-temperature structure.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 226-228
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Hydrogenation on the Electronic Structure of HoNiSn - Ab Initio Calculations
Autorzy:
Jezierski, A.
Szajek, A.
Jurczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/1537053.pdf
Data publikacji:
2010-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
71.15.Ap
71.15.Mb
71.20.Eh
71.20.Lp
Opis:
The electronic and magnetic properties of HoNiSn alloy are studied by ab initio full relativistic full potential local orbital method within the local density approximation. The electronic structures are reported for two crystallographic structures: orthorhombic TiNiSi type and the hexagonal ZrNiAl-type structure. We also study the influence of hydrogenation on the electronic structure of $HoNiSnH_{0.66}$. Ab initio calculations have shown that in the both type of structures the Fermi level is located at the 4f peak of Ho, however we observed the modification of 3d peaks from nickel atoms below the Fermi energy. The hydrogenation leads to increase of the density of states at the Fermi level.
Źródło:
Acta Physica Polonica A; 2010, 118, 2; 346-349
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure of Ternary Antimonides GdNiSb
Autorzy:
Wei, X.
Hu, X.
Dai, Y.
Lei, T.
Chu, S.
Deng, J.
Powiązania:
https://bibliotekanauki.pl/articles/1505358.pdf
Data publikacji:
2011-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
71.15.Ap
71.15.Mb
71.20.Eh
71.20.Lp
Opis:
In the paper density functional theory method was applied to explore the electronic and magnetic properties of the GdNiSb in low-temperature phase with cubic MgAsAg-type structure and in the high-temperature phase. The calculations were performed by first principles full-relativistic full potential local orbital method within the local spin density approximation. The calculations results show the metallic character of GdNiSb compound in the high-temperature phase with hexagonal $AlB_2$-type structure. For the low-temperature phase of the cubic GdNiSb system, they indicate a semiconducting behavior. The density of states below the Fermi level is greater in high-temperature phase than in low-temperature one, the calculated magnetic moment is in good agreement with an available experimental value.
Źródło:
Acta Physica Polonica A; 2011, 119, 3; 405-407
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic and Transport Properties of Possibly Topologically Nontrivial Half-Heusler Bismuthides RMBi (R = Y, Gd, Dy, Ho, Lu; M = Pd, Pt)
Autorzy:
Pavlosiuk, O.
Kaczorowski, D.
Wiśniewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1398607.pdf
Data publikacji:
2016-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Eh
71.55.Ak
72.15.Eb
72.15.Jf
Opis:
High quality single crystals of some representatives of half-Heusler family were grown from Bi-flux. For single crystals characterization, X-ray diffraction and scanning electron microscopy techniques were used. The low-temperature physical properties of the synthesized crystals were determined by means of magnetization, magnetic susceptibility, electrical resistivity and heat capacity measurements. For each compound but LuPtBi, the electrical resistivity varies in a semimetallic manner at high temperatures, and exhibits a metallic character at low temperatures. LuPtBi is metallic in the whole temperature range studied. The bismuthides HoPdBi, LuPdBi, LuPtBi and YPtBi were found superconducting below the critical temperature $T_{c}$ = 0.7, 1.8, 0.9, and 0.96 K, respectively. For the compounds GdPdBi, DyPdBi and HoPdBi, an antiferromagnetic ordering was found to set in below $T_{N}$ = 12.8, 3.7, and 1.9 K, respectively. HoPdBi is thus an intriguing material in which both cooperative phenomena coexist.
Źródło:
Acta Physica Polonica A; 2016, 130, 2; 573-576
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure and Optical Properties of $Ce_{1-x} La_x Pt In$ (0
Autorzy:
Jezierski, A.
Szytuła, A.
Powiązania:
https://bibliotekanauki.pl/articles/1398671.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Ap
71.15.Mb
71.20.Eh
71.23.-k
Opis:
The electronic structure of $Ce_{1-x} La_{x} Pt In$ is studied by means of ab initio full-potential local orbital basis (coherent potential approximation) (FPLO-CPA) and spin polarized relativistic Korringa-Kohn-Rostoker (SPR-KKR-CPA) methods within the densities functional methodologies. In both methods, we have observed decrease of the density of states at the Fermi level versus of La concentration. The theoretical photoemission spectra of LaPtIn and CePtIn are compared with the experimental data and the agreement is good. We have also reported the optical properties of LaPtIn and CePtIn compounds obtained in GGA and GGA+U approximation.
Źródło:
Acta Physica Polonica A; 2016, 129, 1; 109-112
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure and Electron-Transport Properties of (Gd$\text{}_{1-x}$Y$\text{}_{x}$)$\text{}_{2}$In Compounds
Autorzy:
Borgieł, W.
Deniszczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/2013400.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.-d
72.15.-v
71.20.Eh
71.20.-b
Opis:
Based on the electronic structure of the ferromagnetic Gd$\text{}_{2}$In and (Gd$\text{}_{0.5}$ Y$\text{}_{0.5}$)$\text{}_{2}$In compounds the high-temperature magnetic part of the electrical resistivity of (Gd$\text{}_{1-x}$Y$\text{}_{x}$)$\text{}_{2}$In as a function of Y concentration was calculated and analyzed. The main interaction which causes the finite magnetic part of the conductivity was assumed in a form of stochastically distributed in space s-f interaction. The calculated resistivity of (Gd$\text{}_{1-x}$Y$\text{}_{x}$)$\text{}_{2}$In alloys qualitatively reproduces the experimental data.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 783-786
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resistivity of (Gd$\text{}_{1-x}$Y$\text{}_{x}$)$\text{}_{2}$In Alloys at High Temperatures - Two-Band Model Approach
Autorzy:
Borgieł, W.
Deniszczyk, J.
Lipowczan, M.
Braun, J.
Powiązania:
https://bibliotekanauki.pl/articles/2014412.pdf
Data publikacji:
2000-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Eh
71.20.-b
72.15.-v
72.10.-d
Opis:
Two-band model for the substitutionary binary alloy of different rare earth metals with relatively simple 4f multiplet structure placed within the transition metal host matrix was proposed and applied to (Gd$\text{}_{1-x}$Y$\text{}_{x}$)$\text{}_{2}$In. The main interaction which causes the magnetic part of the resistivity was assumed in a form of stochastically distributed in space s-f interaction. The calculated high temperature spin disorder resistivity of (Gd$\text{}_{1-x}$Y$\text{}_{x}$)$\text{}_{2}$In alloys reproduces well the experimental alloys data.
Źródło:
Acta Physica Polonica A; 2000, 98, 5; 547-550
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:
Electronic structure of TmPdIn
Autorzy:
Penc, B.
Kurleto, R.
Goraus, J.
Starowicz, P.
Szytuła, A.
Powiązania:
https://bibliotekanauki.pl/articles/1065057.pdf
Data publikacji:
2016-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Eh
71.15.Mb
79.60.Bm
Opis:
Electronic structure of a ternary TmPdIn compound, which crystallizes in the hexagonal ZrNiAl-type structure, was studied by X-ray photoemission spectroscopy and ultraviolet photoemission spectroscopy. Density of states in the valence band was calculated by means of the augmented plane wave/local orbital method based on density functional theory. The results showed that the valence band is formed mainly of Tm 4f and Pd 4d states. In the ultraviolet photoemission spectra one can distinguish Pd 4d maximum and Tm 4f multiplet peaks, which are displaced with respect to those of pure Tm.
Źródło:
Acta Physica Polonica A; 2016, 129, 6; 1184-1186
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, Roentgenophase Analysis and Physical Properties of $TlIn_{1-x}Er_xSe_2$ Solid Solutions
Autorzy:
Mustafaeva, S.
Kerimova, E.
Gasanov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1402129.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Eh
71.20.-b
71.20.Nr
71.55.-i
72.15.Eb
72.15.Rn
72.20.-i
72.20.Ee
72.20.Jv
72.30.+q
Opis:
The results of high-frequency dielectric measurements on obtained $TlIn_{1-x}Er_xSe_2$ single crystals provided an opportunity to determine the mechanisms of dielectric losses and charge transport, and also to evaluate the density of states at the Fermi level; the average time of charge carrier hopping between localized states, average hopping distance, scattering of trap states near the Fermi level; concentration of deep traps.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 697-699
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coqblin-Schrieffer Impurity with Local Exchange Coupling: a Perturbative Approach
Autorzy:
Stefański, P.
Powiązania:
https://bibliotekanauki.pl/articles/2013008.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.Hf
71.20.Eh
72.15.Qm
75.20.Hr
Opis:
The Coqblin-Schrieffer one-impurity model with the additional local exchange interaction is studied within diagrammatic approach. The Ruderman-Kittel-Kasuya-Yoshida-type local exchange interaction between f electrons of the impurity and a channel of conduction electron l=0 partial waves is treated in the molecular field approximation. The perturbation expansion resummation for the Coqblin-Schrieffer hybridization mediated interaction vertex part is carried out in the ladder approximation yielding the formula for the Kondo temperature T$\text{}_{K}$ decreasing with increased local exchange. Moreover, the temperature divergence of the susceptibility at T$\text{}_{K}$ is shifted towards T=0. For some critical strength of the local exchange interaction the susceptibility approaches a Curie-type dependence as for an uncompensated impurity magnetic moment. A relation to the "Kondo disorder" model, which leads to the non-Fermi-liquid behavior, is discussed.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 385-388
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Band Structure and Magnetic Properties of DO$\text{}_{3}$-Type Fe$\text{}_{3-x}$V$\text{}_{x}$Al Alloys. Super-Cell Approach
Autorzy:
Deniszczyk, J.
Borgieł, W.
Powiązania:
https://bibliotekanauki.pl/articles/2014414.pdf
Data publikacji:
2000-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Eh
71.20.-b
72.15.-v
72.10.-d
Opis:
The electronic structure of Fe$\text{}_{3-x}$V$\text{}_{x}$Al alloys was calculated using the super-cell methodology of alloy modeling. The concentration range of x=0.0÷1.0 was investigated. For a concentration of x=0.0625 the energy based analysis reveals that vanadium prefers to replace the Fe atom at sites with the octahedral coordination. It was found that the iron atoms coordinated by the eight nearest-neighbor Fe atoms preserve their high magnetic moment up to a concentration of x=0.9375 even though the average total magnetic moment goes to zero. The relatively high (≃ -1.0μB) negative magnetic moment of V remains constant up to x≃ 0.5. In the concentration range of x=0.75÷0.9375 the gap at ε$\text{}_{F}$ of the minority density of states is observed while the majority density of states displays a sharp peak structure at the Fermi energy. This feature suggests the heavy-fermion behavior of the Fe$\text{}_{2}$VAl compound.
Źródło:
Acta Physica Polonica A; 2000, 98, 5; 551-554
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure and Thermodynamic Properties of RNi₅Sn (R = La, Ce, Pr, Nd) Compounds
Autorzy:
Jezierski, A.
Kaczkowski, J.
Szytuła, A.
Powiązania:
https://bibliotekanauki.pl/articles/1385161.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Mb
71.20.Eh
64.30.Ef
65.40.Ba
Opis:
The electronic structure, pressure and temperature dependence of thermodynamic properties of RNi₅Sn (R = La, Ce, Pr, Nd) compounds are calculated by ab initio full potential local orbital minimum-base(ver. 9 and ver. 14) method. These compounds crystallize in the hexagonal crystal structure (space group $P6_{c}$/mmc, No. 194). The band calculations were performed in the scalar-relativistic mode for the exchange correlation potentials in the form of the Perdew-Burke-Ernzerhof general gradient approximation. In this work we present the band structures of LaNi₅Sn, CeNi₅Sn, NdNi₅Sn and PrNi₅Sn compounds. The thermodynamic properties (bulk modulus, Debye temperature) are calculated in the Debye-Grüneisen model using the equation of states in the form of Birch-Murnaghan, Poirier-Tarantola and Vinet. Our results have shown that values of thermodynamic properties depend on the method of calculations.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 257-259
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical Resistivity and Electronic Structure of the $Tb_{x}Gd_{1-x}Ni_3$ System
Autorzy:
Chełkowska, G.
Bajorek, A.
Chrobak, A.
Kwiecień-Grudziecka, M.
Powiązania:
https://bibliotekanauki.pl/articles/1427391.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Eh
71.20.Lp
72.15.-v
72.10.Di
79.60.-i
Opis:
In the paper the electric properties and electronic structure of the intermetallic $Tb_{x}Gd_{1-x}Ni_3$ compounds are presented. The partial replacement of Gd by Tb atoms causes the decrease of the Curie temperature $(T_{C})$ and the increase of the residual resistivity. According to the Matthiessen rule the scattering mechanisms in ρ(T) have been analyzed. Moreover, the reduced form of the electrical resistivity $ρ_{Z} (T - T_{0})$ indicates a deviation from the linearity for x > 0.2. This kind of behaviour can be attributed to density of d states near by the Fermi level $(E_{F})$ which are dominated by Ni 3d states. The valence band spectra as well as the core level lines have been analyzed as the influence of Tb/Gd substitution on the electronic structure.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1139-1141
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Transport and Point Contact Spectroscopy of Cubic DyCu$\text{}_{5}$
Autorzy:
Nenkov, K.
Idzikowski, B.
Ilkovic, S.
Kačmarčiková, E.
Reiffers, M.
Müller, K.
Powiązania:
https://bibliotekanauki.pl/articles/2013688.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Eh
72.15.Eb
73.23.Ad
73.40.Jn
Opis:
The electron transport properties and point contact spectra of melt-spun DyCu$\text{}_{5}$ with the cubic phase (structure type AuBe$\text{}_{5}$, space group $F\overline{4}3m$) were investigated. It was found by ac-susceptibility measurements that below a transition temperature T$\text{}_{m}$=6.5 K this phase shows metamagnetism. Between T$\text{}_{m}$ and T$\text{}_{C}$=14.5 K a spontaneous magnetization is found. Our measurements of electrical resistivity confirm the existence of two magnetic phase transitions in the compound. Furthermore, we present point contact spectra of DyCu$\text{}_{5}$-Cu heterocontacts which are directly proportional to the electron-quasiparticle interaction function. Apart from a peak at about 18 meV, which is characteristic of electron-phonon interaction in pure Cu, we observed a series of additional maxima at lower energy, which are connected with the allowed 4f-transitions from the ground state to excited crystalline electric field levels.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 843-846
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 16

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