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    Wyświetlanie 1-6 z 6
    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:
    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:
    Anomalous Transport and Thermal Properties of the Solid Solutions U$\text{}_{1-x}$Th$\text{}_{x}$Cu$\text{}_{5}$M (M = Al, Ga, In and Sn)
    Autorzy:
    Troć, R.
    Tran, V. H.
    Kaczorowski, D.
    Czopnik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011211.pdf
    Data publikacji:
    2000-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Mb
    72.15.Qm
    75.20.Hr
    Opis:
    UCu$\text{}_{5}$M-type compounds are moderate heavy fermion systems with an antiferromagnetic order below T$\text{}_{N}$ = 18, 16-25, and 25 K for M = Al, (Ga, In), and In, respectively, and a ferrimagnetic order with T$\text{}_{C}$ = 54 K for M = Sn. We present the results of magnetoresistance measurements as a function of temperature and applied magnetic field for the pure compounds and for their solid solutions containing Th, i.e. U$\text{}_{1-x}$Th$\text{}_{x}$Cu$\text{}_{5}$M. Only in the case of UCu$\text{}_{5}$In a substantial positive contribution to the magnetoresistance was observed at low temperatures, as for normal antiferromagnets. For the Al- and Sn-based alloys the magnetoresistance at low temperatures is negative, and its field variation proves the existence of Kondo-type interactions. On Th-substitution the magnetic phase transition is shifted to lower temperature and simultaneously the magnetoresistance becomes less negative. The field dependence of the magnetoresistance of these alloys can be well described by the Coqblin-Schrieffer model. Interestingly, the heat capacity measurements have revealed a general tendency to increase the linear coefficient γ with magnetic dilution of a given UCu$\text{}_{5}$M compound by Th-substitution. This feature reflects an enlargement of the effective mass of conduction electrons with the increase in both the unit cell volume and magnetic dilution. Such a tendency is also observed for the system UCu$\text{}_{5}$(In$\text{}_{1-x}$Ga$\text{}_{x}$), though the unit cell is here suppressed with increasing x. Thus, a similar physical picture is reached in all these systems but involving probably different mechanisms.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 1; 25-35
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Substitution Study on the Coherent Kondo State in CeCu$\text{}_{5}$In
    Autorzy:
    Kaczorowski, D.
    Kalychak, Ya. M.
    Zaremba, V. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2012871.pdf
    Data publikacji:
    2000-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Mb
    72.15.Qm
    75.20.Hr
    Opis:
    Ternary alloys CeCu$\text{}_{5-x}$In$\text{}_{1+x}$ were studied by means of magnetic and electrical resistivity measurements. In CeCu$\text{}_{5}$In a coherent Kondo state without long-range magnetic order develops at low temperatures. It transforms into an incoherent Kondo state upon small substitution of In for Cu.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 1; 189-192
    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:
    Magnetic Order and SdH Effect in Half-Heusler Phase ErPdBi
    Autorzy:
    Pavlosiuk, O.
    Filar, K.
    Wiśniewski, P.
    Kaczorowski, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1388106.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.10.+v
    75.40.Cx
    71.18.+y
    71.20.Eh
    72.15.Gd
    Opis:
    Single crystals of ErPdBi were grown from Bi-flux. The crystal structure of MgAgAs-type was confirmed using X-ray diffraction. Magnetization, magnetic susceptibility, electrical resistance and heat capacity measurements revealed an antiferromagnetic phase transition at $T_{N}$ = 1.2 K. At high temperatures, the electrical resistance has a semiconducting-like character (dR/dT < 0 ). The resistance starts decreasing with decreasing T below 15 K and shows a very sharp drop below $T_{N}$ but remains finite down to 0.4 K. Hence, no obvious evidence of superconductivity was found in the electrical transport data. On the other hand, the real part of AC magnetic susceptibility is negative below $T_{C}$ = 1.6 K and its imaginary component has a clear maximum at this temperature that might be associated with the onset of superconducting state. The electrical resistance revealed Shubnikov-de Haas oscillations in magnetic fields 8-33 T. Their amplitude decreases with increasing T and disappears above 10 K. Cyclotron mass determined from this dependence is 0.21 $m_{e}$.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 656-658
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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