Abstract
Ceramic high-TC superconductors may be viewed as a weakly coupled random Josephson network containing the so-called π-junctions, and a chiral-glass transition is predicted to be occurred in such d-wave ceramics. In the present work, pressure dependence of the chiral-glass transition have been investigated on YBa2Cu3O7−y and YBa2Cu4O8 ceramics. With decreasing temperature, a superconducting order occurs at first inside each grain at TC1 and furthermore among the grains at TC2 (<TC1). The TC2 increases with increase of pressure, while the sharpness of the transition at TC2 does not change. In spite of differences in not only TC2’s but also TC1’s, the increasing rates of TC2 by pressure are nearly the same.
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