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nonlinear Temperature Dependence of Magnetizati.n.of Two-Band Superconductors near Upper Critical Field

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Communicati.n. in Theoretical Physics 2007年第5X期48卷 949-952页

作者： i.n. askerzade Abdus Salam internati.n.l Center for Theoretical Physics Faculty of Sciences Strada Costeria 11 34014 Trieste Italy institute of Physics Azerbaijan National Academy of Sciences Baku-Az1143 Azerbaijan Physics Department Faculty of Sciences Ankara University 06100 Tandogan Ankara Turkey

Temperature dependence of the magnetizati.n.M （T） of two-band superconductors is studied in the vicinity of upper critical field He2 by using a two-band Ginzburg-Landau （GL） theory. it is shown that magnetizati.n.M（T） has a nonlinear character due to positive curvature of upper critical field Hc2（T） and temperature dependence of effective Ginzburg-Landau parameter neff（T）. The results are shown to be in qualitative agreement with experimental data for the superconducting magnesium diboride, MgB2.

关键词： two-band superconductivity Ginzburg-Landau theory magnetization

Pressure and Doping Effects on Critical Temperature in MgB_2 and nonmagnetic Borocarbides within Two-Band Eliashberg Theory

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Communicati.n. in Theoretical Physics 2010年第6期53卷 1181-1184页

作者： i.n.askerzade Computer Engineering Department of Engineering Faculty of Ankara University institute of Physics Azerbaijan nati.n.l Academy of Sci.n.es

Critical temperature of Mg1-xAlxB2, MgB2-xCx are calculated using two-band Eliashberg theory in intermediate e-ph coupling. Analytical calculati.n. are conducted for different values of doping parameters x in this compounds. Pressure effects on critical temperature in MgB2 and nonmagnetic borocarbide Yni2B2C are also investigated. Results is compared with available experimental data and good agreement is achieved.

关键词： Jtwo-band superconductivity Eliashberg theory magnesium diboride nonmagnetic borocarbides

Anisotropy of Critical Fields in MgB_2: Two-Band Ginzburg-Landau Theory for Layered Superconductors

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Communicati.n. in Theoretical Physics 2009年第3期51卷 563-569页

作者： i.n.askerzade B.Tanatar institute of Physics Azerbaijan National Academy of Sciences Department of Physics Bilkent University Department of Computer Engineering Engineering Faculty of Ankara University

The temperature dependence of the anisotropy parameter of upper critical field γHe2 （T） = Hc2^‖ （T） /Hc2^⊥ （T） and London penetrati.n.depth γλ （T） = λ‖（T）/λ⊥ （T） are calculated using two-band Ginzburg-Landau theory for layered superconductors. it is shown that, with decreasing temperature the anisotropy parameter γHc2 （T） is increased, while the London penetrati.n.depth anisotropy γλ（T） reveals an opposite behavior. Results of our calculati.n. are in agreement with experimental data for single crystal MgB2 and with other calculati.n...Results of an analysis of magnetic field Hc1 in a single vortex between superconducting layers are also presented.

关键词： two-band superconductivity Ginzburg-Landau theory layered superconductors critical magnetic fields