Abstract
We have studied the behavior of second-order nonlinear susceptibility χ (2) of an infinite-layer superconductor (Sr 0.7 Ca 0.3 ) 0.95 CuO 2- x to search for the chiral-glass state predicted by Kawamura for a d -wave ceramic. The linear and nonlinear susceptibilities are composed of the measured harmonic susceptibilities up to the seventh-order harmonics. The second-order nonlinear susceptibility χ (2) shows a negative peak but oscillates as a function of temperature near T c . This is not consistent with the prediction based on a chiral-glass transition. The Bean critical-state model explains the observed χ (2) behavior well. It is necessary to avoid the effect of vortex pinning to find a chiral-glass transition.
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