Zurek-Kibble domain structures: the dynamics of spontaneous vortex formation in annular Josephson tunnel junctions.
Phase transitions create a domain structure with defects, which has been argued by Zurek and Kibble (ZK) to depend in a characteristic way on the quench rate. We present an experiment to measure the ZK scaling exponent sigma. Using long symmetric Josephson tunnel junctions, for which the predicted index is sigma=0.25, we find sigma=0.27+/-0.05. Further, we agree with the ZK prediction for the overall normalization.
Istituto di Cibernetica del C.N.R., I-80078, Pozzuoli, Italy and Unita' INFM-Dipartimento di Fisica, Universita' di Salerno, I-84081 Baronissi, Italy. roberto@sa.infn.it
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