Chiral glass: a new equilibrium phase of ceramic high-Tc superconductors

Abstract

Possible occurrence of an equilibrium thermodynamic phase with a spontaneously broken time-reversal symmetry is studied in a model ceramic superconductor with anisotropic pairing symmetry. It is shown by Monte Carlo simulations that such a ``chiral-glass'' phase is truly stable even under the influence of screening. Existence of frustration in zero external field, arising from the d-wave pairing symmetry of high-T_c superconductors, is essential to realize this phase. Via a finite-size scaling analysis, critical exponents associated with the chiral-glass transition are estimated to be ν_CG=1.3\pm 0.2 and η_CG=-0.2\pm 0.2. These values turn out to be close to those of the Ising spin glass. Phase diagram of the model is constructed and the implications to experiments are discussed.

30 pages, 23 figures, LaTex

Cited by in corpus (12)

• Nature of the ordering of the three-dimensional XY spin glass
• The ordering of XY spin glasses
• Monte Carlo simulations of the three-dimensional XY spin glass focusing on the chiral and the spin order
• Aging Effect in Ceramic Superconductors
• Nature of the vortex-glass order in strongly type-II superconductors
• Magnetic measurements and kinetic energy of the superconducting condensate in SmBa_2Cu_3O_{7-δ}
• Second harmonics and compensation effect in ceramic superconductors
• Study on successive superconducting transitions in Ta${}_2$S${}_2$C from electrical resistivity and nonlinear AC magnetic susceptibility
• AC resistivity of d-wave ceramic superconductors
• Nonlinear AC resistivity in s-wave and d-wave disordered granular superconductors
• Microwave absorption in s- and d-wave disordered superconductors
• Critical behavior of spin and chiral degrees of freedom in three-dimensional disordered XY models studied by the nonequilibrium aging method