A. Anand et al., PHASE REVERSAL OF NONRESONANT MICROWAVE-ABSORPTION IN SUPERCONDUCTINGYBACUO CUO POWDER MIXTURES/, Solid state communications, 99(9), 1996, pp. 665-668
Non-resonant microwave absorption is studied as a function of temperat
ure and composition in superconducting YBa2Cu3O7/CuO ceramic composite
samples. In pure YBa2Cu3O7 only normal field dependence of the absorp
tion is observed, where as in composites an anomalous non-monotonic fi
eld dependence is seen. The results are explained using an extended re
sistively shunted junction model and invoking the occurrence of juncti
ons with phase difference psi(0) such that pi/2 < psi(0) < 3 pi/2. Cop
yright (C) 1996 Elsevier Science Ltd