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    Wyświetlanie 1-8 z 8
    Tytuł:
    Resonance Tunneling in Ferromagnet-Triplet Superconductors Junctions
    Autorzy:
    Kowalewski, L.
    Wojciechowski, R. J.
    Wojtuś, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047330.pdf
    Data publikacji:
    2007-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.Pq
    73.40.-c
    74.45.+c
    Opis:
    We discuss the tunneling conductance in a ferromagnet-insulator-triplet superconductor junction. We consider the superconducting order parameters with spin triplet pairing having nodes. The nodal structure of the order parameter has been recently confirmed experimentally in Sr$\text{}_{2}$RuO$\text{}_{4}$. In particular, we study how a mid-gap structure of the tunnelling conductance depends on the phase difference of the pairing potential as well as on the orientation of the interface.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 5; 683-691
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetotransport Properties of $CaTi_xRu_{1-x}O_3$ (x=0, 0.07)
    Autorzy:
    Zorkovská, A.
    Baran, A.
    Feher, A.
    Šebek, J.
    Šantavá, E.
    Bradarić, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813683.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.Pq
    73.43.Qt
    75.47.-m
    Opis:
    Electrical resistance, transversal magnetoresistance and the Hall effect were studied on polycrystalline $CaTi_xRu_{1-x}O_3$ (x=0, 0.07) samples using a conventional Quantum Design PPMS-9 equipment in the temperature range 2-300 K and magnetic field up to 9 T. Substantial differences were found between the two samples: (i) opposite to the metallic character of $CaRuO_3$, the substituted sample has insulating-like electrical resistance;(ii) the magnetoresistance of the substituted sample changes the sign from negative to positive values with increasing temperature. The magnetoresistance of $CaRuO_3$ is negative, the sign reversal is induced by magnetic field and only at temperatures below 15 K, such a behaviour is predicted for clustered systems;(iii) the Hall voltage in pure $CaRuO_3$ also changes sign from negative to positive values above 35 K. This temperature coincides with the observed magnetic transition temperature, indicating that the magnetic state and the carrier character interrelate.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 351-354
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ti-Induced Ferromagnetism and the Specific Heat of $CaTi_xRu_{1-x}O_3$ (x=0, 0.005, 0.03)
    Autorzy:
    Zorkovská, A.
    Baran, A.
    Kajňaková, M.
    Feher, A.
    Šebek, J.
    Šantavá, E.
    Bradarić, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813685.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.Pq
    75.40.Cx
    72.80.Ga
    Opis:
    The influence of Ti substitution on the specific heat of the $CaTi_xRu_{1-x}O_3$ system at low concentrations x=0, 0.005, and 0.03 was studied in the temperature range of 2-300 K at magnetic fields up to 9 T. Small peak was revealed in the C/T vs. $T^2$ dependence at around 3 K, which are field sensitive (the electronic specific heat coefficient γlinearly decreases with the increase in magnetic field), and might be connected to some kind of magnetic ordering. The coefficient γis suppressed also by Ti substitution.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 355-358
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetism and Superconductivity in Iron Pnictides
    Autorzy:
    Singh, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1426673.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.Xa
    74.20.Rp
    74.20.Pq
    Opis:
    The discovery of high temperature superconductivity in iron pnictides and chalcogenides has resulted in surprising new insights into high temperature superconductivity and its relationship with magnetism. Here we provide an overview of some of what is known about these materials and in particular about the interplay of magnetism and superconductivity in them. Similarities and contrasts with cuprate superconductors are emphasized and the superconducting pairing is discussed within the framework of spin fluctuation induced pairing.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 999-1004
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Pressure Effects on Electronic Structure of Iron Chalcogenide Superconductors $FeSe_{1-x}Te_x$
    Autorzy:
    Ciechan, A.
    Winiarski, M.
    Samsel-Czekała, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1431323.pdf
    Data publikacji:
    2012-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.20.Pq
    74.25.Kc
    74.62.F
    74.70.Xa
    Opis:
    We study the electronic structure of iron-based superconductors $FeSe_{1-x}Te_x$ within the density functional theory. We pay particular attention to the pressure effects on the Fermi surface (FS) topology, which seem to be correlated with a critical superconducting temperature $T_C$ of iron chalcogenides and pnictides. A reduction of the FS nesting between hole and electron cylinders with increasing pressure is observed, which can lead to higher values of $T_C$. The tellurium substitution into selenium sites yields FS changes similar to the pressure effect.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 4; 820-823
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Remarks on the Hall Conductivity in Chiral Superconductors: Weak vs. Strong Coupling Approach
    Autorzy:
    Rogatko, M.
    Wysokiński, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1374790.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.20.-z
    74.25.F-
    74.70.Pq
    11.25.Tq
    Opis:
    We discuss the calculations of the ac Hall conductivity for superconductors with the time reversal symmetry breaking states. In the weak coupling theories these states show vanishing Hall response in one band models, even though one expects otherwise on symmetry grounds. On the other hand, the strong coupling approach based on the anti-de Sitter-conformal field theory correspondence leads to the non-vanishing Hall conductivity. We discuss the possible reasons of the discrepancy. The weak coupling many orbital theory leading to the Hall conductivity with correct temperature dependence is also briefly presented.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4a; A-9-A-12
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interference Effects in T-MOKE Spectra of Fe Thin Films at the 3p Edges - Theory and Experiment
    Autorzy:
    Legut, D.
    Tesch, M.
    Oppeneer, P.
    Mertins, H.
    Jansing, Ch.
    Gilbert, M.
    Gaupp, A.
    Bürgler, D.
    Schneider, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1386641.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    78.20.Ls
    78.70.Ck
    74.20.Pq
    Opis:
    We present combined first-principle calculations and experimental results of the transversal magneto-optical Kerr effect (T-MOKE) of thin Fe films across the 3p edges using linearly polarized synchrotron radiation. We show that the experimental T-MOKE spectra at the 3p edges of Fe exhibit clear signals that are strongly influenced by interference effects. Ab initio calculated T-MOKE asymmetry spectra confirm the importance of interference effects. The comparison of experimental with calculated spectra reveals some differences that we attribute to metal/metal interface roughness that is not taken into account in the calculations.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 466-468
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First Principles Calculation of ε-Phase of Solid Oxygen
    Autorzy:
    Kamaruddin, K.
    Abedin, A.
    Zabidi, N.
    Yahya, M.
    Taib, M.
    Rosli, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398703.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.20.Pq
    74.70.-b
    31.15.E-
    75.50.Xx
    Opis:
    The electronic structures of ε-phase of solid oxygen (O₂)₄ are studied within the framework of density-functional theory. The intriguing molecule has been known to have magnetic properties at room temperature by applying pressure. Nevertheless, until now there was no evidence of band structure studied in the antiferromagnetic behaviour of (O₂)₄. We report a comparison study for spin and non-spin polarization orbital which suggests that this ferromagnetic configuration of (O₂)₄ could not be seen experimentally, and antiferromagnetic configuration of (O₂)₄ was seen at higher pressure of about 10 GPa. The antiferromagnetic state transforms into the superconducting state as the sample temperature decreases. The results can serve as a useful approximation in studying general features of the electronic structure. The (O₂)₄ clusters are reported in the Raman study, having significant absorption at 1516 cm¯¹ below infrared region.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 468-471
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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