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Wyszukujesz frazę "75.20.Hr" wg kryterium: Wszystkie pola


Tytuł:
Magnetic Susceptibility of HgTe⟨Mn,Fe,Cr⟩
Autorzy:
Frasunyak, V. M.
Gavaleshko, M. P.
Powiązania:
https://bibliotekanauki.pl/articles/1933741.pdf
Data publikacji:
1995-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.Hr
Opis:
The results of the investigations of magnetic susceptibility (χ) of HgTe⟨Mn,Fe,Cr⟩ with N$\text{}_{3d}$ < 10$\text{}^{21}$ cm$\text{}^{-3}$ in temperature range of 80-290 K and for magnetic fields of 0.4-9 kOe are presented. It was shown that χ$\text{}_{Mn}$(T) and χ$\text{}_{Fe}$(T) in HgTe⟨Mn,Fe⟩ are described by Curie law and for Ν$\text{}_{3d}$ > 10$\text{}^{21}$ cm$\text{}^{-3}$ - by Curie-Weiss law with negative value of θ$\text{}_{p}$, characterizing the antiferromagnetic interaction between magnetic ions. Thermal treatment of HgTe⟨Fe⟩ samples in Hg vapour at Τ = 500 K in contrast to HgTe⟨Mn⟩ leads to the redistribution of magnetic component only in these samples. A special behaviour of χ(T) in HgTe⟨Cr⟩ samples was revealed which is different from x(T) in HgTe⟨Mn,Fe⟩.
Źródło:
Acta Physica Polonica A; 1995, 88, 4; 715-718
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic and Magnetic Properties of $ThCo_4B$
Autorzy:
Szajek, A.
Powiązania:
https://bibliotekanauki.pl/articles/1813651.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
75.20.Hr
Opis:
$ThCo_4B$ compound crystallizes in the hexagonal $CeCo_4B$ type structure. The electronic structure is calculated based on full-potential local-orbital full-relativistic method. The ab initio calculations showed that small magnetic moments (≈0.1 $μ_B$/atom) are formed on Th and B atoms, antiparallel to the moments on Co atoms equal to 1.55 and 0.43 $μ_B$/atom for Co(2c) and Co(6i), respectively. The densities of states at the Fermi level are equal to 1.3 and 5.4 states/(eV spin f.u.) for spin up and down, respectively. These values are predominated by Co(3d) electrons.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 283-286
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Mott Transition in Disordered Systems
Autorzy:
Dobrosavljević, V.
Kotliar, G.
Powiązania:
https://bibliotekanauki.pl/articles/1860793.pdf
Data publikacji:
1994-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.Hr
71.55.Jv
Opis:
We review the recent progress in understanding the Mott transition in disordered systems using the mean-field approach to the strong correlation problem. It is based on a new functional integral formulation of the disordered interacting electron problem. The saddle-point solution recovers a mean-field theory of the strong correlation problem, and becomes exact in the limit of large spatial coordination. We compare the results of the mean-field theory with experimental findings and indicate directions for future work.
Źródło:
Acta Physica Polonica A; 1994, 85, 1; 21-38
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetization of Pb$\text{}_{1-x}$Cr$\text{}_{x}$Te Semimagnetic Semiconductor
Autorzy:
Mac, W.
Story, T.
Twardowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1876309.pdf
Data publikacji:
1995-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Pp
75.20.Hr
Opis:
We present experimental studies of magnetization of Pb$\text{}_{1-x}$Cr$\text{}_{x}$Te (x ≤ 0.01) crystals. The reasonable description of the data is obtained for a composition of x ≤ 0.001 using Cr$\text{}^{+++}$ model (Brillouin type paramagnetism S = 3/2).
Źródło:
Acta Physica Polonica A; 1995, 87, 2; 492-494
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jahn-Teller Center as Quasiparticle of Fractional Statistics
Autorzy:
Sobolewski, A. I.
Powiązania:
https://bibliotekanauki.pl/articles/1933566.pdf
Data publikacji:
1995-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.Hr
31.10.+z
Opis:
Arguments are presented towards the identification of a molecular center undergoing a linear E⊗e Jahn-Teller effect as a quasiparticle of fractional statistics. The relevance of Jahn-Teller quasiparticles for the description of the type-II superconductivity is briefly discussed.
Źródło:
Acta Physica Polonica A; 1995, 88, 2; 305-313
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anisotropy of Magnetic Interactions in HgFeSe
Autorzy:
Wilamowski, Z.
Przybylińska, H.
Joss, W.
Guillot, M.
Powiązania:
https://bibliotekanauki.pl/articles/1921599.pdf
Data publikacji:
1992-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Ey
75.20.Hr
Opis:
Magnetic properties (susceptibility, high-field torque and magnetization) of cubic HgFeSe are analyzed. Van Vleck magnetism of Fe$\text{}^{2+}$ is well evidenced. The energy splitting of the Fe levels in HgSe is shown to differ considerably from that in other II-VI compounds.
Źródło:
Acta Physica Polonica A; 1992, 82, 4; 689-692
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Is the Magnetism of HgSe:Fe Clearly Understood?
Autorzy:
Dybko, K.
Łusakowski, A.
Kossut, J.
Arciszewska, M.
vd Linden, P. J. E. M.
Wittlin, A.
Perenboom, J. A. A. J.
Mycielski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1931952.pdf
Data publikacji:
1995-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Hx
75.20.Hr
Opis:
The high magnetic field magnetization measurements of low composition Hg$\text{}_{1-x}$Fe$\text{}_{x}$Se (0.0002 < x < 0.003) at temperatures ranging from 1.6 K to 40 K and in magnetic fields up to 20 T are reported. The magnetization in a sample containing only Fe$\text{}^{3+}$ ions (x = 0.0002) is described by the Brillouin function (j = 5/2). The magnetization in the sample codoped with Ga, containing only Fe$\text{}^{2+}$ is well described in the model of isolated Fe$\text{}^{2+}$ ions. The latter model takes into account the tetrahedral crystal field, the spin-orbit interaction and the Zeeman term. On the other hand, the magnetization of sample with both Fe$\text{}^{3+}$ and Fe$\text{}^{2+}$ present simultaneously (x = 0.003) is shown to be different from a simple additive superposition of the contributions due to Fe$\text{}^{3+}$ and Fe$\text{}^{2+}$ subsystems. The possible origin of this discrepancy is discussed.
Źródło:
Acta Physica Polonica A; 1995, 87, 1; 193-196
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low Temperature Transport and Magnetic Properties of SmB$\text{}_{6}$
Autorzy:
Gabani, S.
Flachbart, K.
Pavlík, V.
Konovalova, E.
Paderno, Y.
Herrmannsdörfer, T.
Powiązania:
https://bibliotekanauki.pl/articles/2013029.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.Hr
71.28.+d
Opis:
We present results of transport and magnetic properties of three single-crystalline samples of the intermediate valence small-gap semiconductor SmB$\text{}_{6}$ at low temperatures. The received resistivity dependences of the samples below 0.5 K exhibit an activated behavior with an energy gap of a few mK. The temperature dependences of the magnetic susceptibility show an increase below 15 K which can be accounted for by impurities, by bare Sm$\text{}^{3+}$ ions or by a small amount of in-gap magnetic 4f$\text{}^{5}$5d$\text{}^{1}$ states.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 419-422
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of Icosahedral (Au,Cu)-Al-Yb Quasicrystals
Autorzy:
Oki, S.
Hiroto, T.
Muro, Y.
Tamura, R.
Powiązania:
https://bibliotekanauki.pl/articles/1373451.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.20.Hr
Opis:
We have synthesized Cu-substituted (Au,Cu)-Al-Yb quasicrystals in order to investigate the relationship between the quasilattice constant and the magnetic property. The quasilattice constant $a_{R}$ is found to decrease as Au is replaced by Cu, and the maximum reduction of 2.18% in $a_{R}$ was observed for x=0.60 in $(Au_{1-x}Cu_x)_{49}Al_{34}Yb_{17}$. Magnetic measurements of $(Au_{1-x}Cu_x)_{49}Al_{34}Yb_{17}$ (x=0, 0.10, 0.20, 0.50) show that the intermediate-valence state of Yb persists in all the studied compositions. The effective magnetic moment is found to depend on r̅/$a_{R}$ rather than on the quasilattice constant $a_{R}$. This suggests that r̅/$a_{R}$ can be regarded as a measure of the chemical pressure induced on the Yb atoms.
Źródło:
Acta Physica Polonica A; 2014, 126, 2; 553-555
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Behaviour in CeNiGa$\text{}_{2}$ and Ce$\text{}_{2}$Ni$\text{}_{2}$Ga
Autorzy:
Kaczorowski, D.
Rogl, P.
Powiązania:
https://bibliotekanauki.pl/articles/1964573.pdf
Data publikacji:
1997-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.Hr
75.30.Mb
Opis:
The bulk properties of CeNiGa$\text{}_{2}$ and Ce$\text{}_{2}$Νi$\text{}_{2}$Ga were studied by means of magnetic susceptibility, magnetization and electrical resistivity measurements. It was found that CeNiGa$\text{}_{2}$ is an antiferromagnetically ordered dense Kondo system whereas Ce$\text{}_{2}$Ni$\text{}_{2}$Ga exhibits a fluctuating valence behaviour.
Źródło:
Acta Physica Polonica A; 1997, 92, 2; 289-293
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Importance of the Spin-Orbit Coupling for 3d-Ion Compounds: the Case of NiO
Autorzy:
Radwański, R. J.
Ropka, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2013984.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.Hr
71.70.Ej
Opis:
The orbital and spin moment of the Ni$\text{}^{2+}$ ion in NiO has been calculated at 0 K to be 0.54 μ$\text{}_{B}$ and 1.99 μ$\text{}_{B}$ respectively. Such large orbital moment, more than 20% of the total moment of 2.53 μ$\text{}_{B}$, proves the need for the "unquenching" of the orbital moment in compounds containing 3d ions. It turns out that the spin-orbit coupling is indispensable for description of magnetic and electronic properties of 3d-ion compounds.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 963-965
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ab Initio Study of Electronic and Magnetic Structure and Structural Phase Transition of $(Fe_{1 - x}Mn_{x})_2P_{1 - y}Ge_{y}$ Alloys
Autorzy:
Deniszczyk, J.
Woźniakowski, A.
Kolano, R.
Kolano-Burian, A.
Powiązania:
https://bibliotekanauki.pl/articles/1427520.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Be
75.20.Hr
Opis:
The paper presents results of the ab initio electronic structure calculations performed for the $(Fe_{0.5}Mn_{0.5})_2P_{0.67}Ge_{0.33}$ alloy, a member of $(Fe_{1 - x}Mn_{x})_2P_{1 - y}Ge_{y}$ family of alloys showing a giant magnetocaloric effect. Calculations confirmed the strong relationship between the magnetic state and crystal structure of the alloy. To investigate the isostructural phase transition driven by external magnetic field observed in $(Fe_{0.9}Mn_{1.1})P_{0.8}Ge_{0.2}$ we utilized the fixed spin moment approach. Total energy analysis confirmed the occurrence of isostructural phase transition.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1162-1164
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two Kondo Impurities in Armchair Graphene Nanoribbon
Autorzy:
Lipiński, S.
Krychowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/1426905.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.22.Pr
75.20.Hr
75.30.Et
Opis:
An interplay of the Kondo effect and inter-impurity correlations in the armchair graphene nanoribbon is studied in the mean field slave boson approach. The effect of the hole doping is examined.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1063-1065
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Susceptibility Studies of Fe-Doped II-VI Compounds
Autorzy:
Arciszewska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1886787.pdf
Data publikacji:
1991-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.Hr
72.80.Ey
75.30.Cr
Opis:
Low-field magnetic susceptibility χ of Fe-doped II-VI compounds has been studied for wide iron concentration range (3 x 10$\text{}^{18}$ ≤ N$\text{}_{Fe}$ ≤ 10$\text{}^{21}$ cm$\text{}^{-3}$). For the low iron content the Van Vleck-type paramagnetism is observed at low temperatures in all investigated materials (except for Hg$\text{}_{1-x}$Fe$\text{}_{x}$Se), which entirely confirms the theoretical prediction. For the higher Fe contents the experimental data still remain unexplained.
Źródło:
Acta Physica Polonica A; 1991, 79, 2-3; 341-344
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Magnetic Impurities in Gapless Fermi Systems
Autorzy:
Borkowski, L. S.
Powiązania:
https://bibliotekanauki.pl/articles/1955519.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Qm
75.20.Hr
74.70.Tx
Opis:
In ordinary metals, antiferromagnetic exchange between conduction electrons and a magnetic impurity leads to screening of the impurity spin below the Kondo temperature, T$\text{}_{K}$. In systems such as semimetals, small-gap semiconductors and unconventional superconductors, a reduction in available conduction states near the chemical potential can greatly depress T$\text{}_{K}$. The behavior of an Anderson impurity in a model with a power-law density of states, ρ(ε) ∝ |ε|$\text{}^{r}$, r>0, for |ε|<Δp, where Δp is small compared to the bandwidth, is studied using the non-crossing approximation. The transition from the Kondo singlet to the magnetic ground state can be seen in the behavior of the impurity magnetic susceptibility χ. The product Tχ saturates at a finite value at low temperature for coupling smaller than the critical one. For sufficiently large coupling Tχ → 0, as T → 0, indicating a complete screening of the impurity spin.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 359-362
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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