A phenomenological theory for the spin-glass ordering in Fe doped YBa2Cu3O7+y
- 19 Downloads
A phenomenological theory for spin-glass superconductor, based on a generalized Ginzburg-Landau free-energy functional d0epending on superconducting and spin-glass order parameters, is presented. It is found that the coupling between the superconducting and spin-glass order assists in freezing spins by enhancing the spin-glass order parameter but acts as a pair breaking effect for superconducting order by decreasing the superconducting order parameter. The schematic behavior of several thermodynamic quantities has been discussed. It is found that all these quantities show either cusps or discontinuities at the superconducting and/or spinglass transition temperatures.
Key wordsSuperconductivity spin-glass Ginzburg-Landau theory thermodynamic properties
Unable to display preview. Download preview PDF.
- 1.S. Katanoet al., Phys. Rev. B 41, 2009 (1990): M. Hennionet al., Physica C 11, 124 (1989).Google Scholar
- 2.T. Tamakiet al., Solid State Commun. 65, 43 (1988); E. R. Baumingeret al., ibid. 65, 123 (1988); E. B. Saitovich and F. J. Litterst,J. Phys.: Condens. Matter 3, 4057 (1991).Google Scholar
- 3.D. Davidovet al., J. Phys. F 7, L47 (1977).Google Scholar
- 4.M. Cyrot,Rep. Prog. Phys. 36, 103 (1973); V. L. Ginzburg and L. D. LandauZh. Eksp. Teor. Fiz. 20, 1964 (1950).Google Scholar
- 5.M. P. Daset al., J. Mod. Phys. B 2, 1513 (1988); J. F. Annett,Adv. Phys. 39, 83 (1990).Google Scholar
- 6.P. Fulde and J. Keller, inSuperconductivity in Ternary Systems, O. Fisher and M. B. Mapple, eds. (Springer-Verlag, Berlin, 1983), pp. 251.Google Scholar
- 7.K. Binder and A. P. Young,Rev. Mod. Phys. 58, 801 (1986).Google Scholar
- 8.M. V. Sadovskii and Yu N. Skryabin,Phys. Status Solidi 14, 59 (1977).Google Scholar