Monte Carlo studies of the ordering of ceramic superconductors: Chiral-glass, orbital-glass, and nonlinear susceptibilities
- Faculty of Engineering and Design, Kyoto Institute of Technology, Sakyo-ku, Kyoto 606 (Japan)
Static and dynamic properties of the intergranular ordering of ceramic superconductors are studied by Monte Carlo simulations on a three-dimensional lattice model of a Josephson-junction array with finite self-inductance. Both cases of {ital d}-wave and {ital s}-wave pairing symmetries are studied. In the case of {ital d}-wave ceramics, intrinsic frustration effects combined with quenched randomness lead to the glassy behavior reminiscent of the spin glass even in zero magnetic field. It is found that the zero-field nonlinear susceptibility exhibits a negatively divergent behavior, suggesting the occurrence of a cooperative transition into an ordered state characterized by the random freezing of chirality or flux. In this {open_quote}{open_quote}chiral-glass{close_quote}{close_quote} state, global {ital Z}{sub 2} time-reversal symmetry appears to be broken spontaneously with keeping the {ital U}(1) gauge symmetry. Dynamic simulations on the linear ac susceptibility suggest that {ital d}-wave ceramics exhibits much stronger dissipation than {ital s}-wave ceramics in the low-frequency regime. In the case of {ital s}-wave ceramics, standard superconducting transitions with broken {ital U}(1) gauge symmetry occurs where nonlinear susceptibility exhibits only a very weak anomaly. Implications to experiments on high-{ital T}{sub {ital c}} ceramics are discussed. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 285635
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 54, Issue 1; Other Information: PBD: Jul 1996
- Country of Publication:
- United States
- Language:
- English
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