Spontaneous Magnetic Field near a Time-Reversal Symmetry Broken Surface State of YBCO
Abstract
Spatial distributions of spontaneous magnetic fields near a surface of cuprate high-TC superconductor YBCO with broken time-reversal symmetry are calculated using the Ginzburg-Landau theory derived from the t-J model. It is found that the magnetic field exists in a narrow region inside the superconductor, and it decays quickly outside the surface. Experimental approaches possible to detect such spontaneous magnetic fields are discussed.
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