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VOLUME 67 (1998) | ISSUE 9 | PAGE 650
Nonlinear seebeck effect in a model granular superconductor
PACS: 74.50.+r, 75.80.+q
The change of the Josephson supercurrent density j» of a weakly-connected granular superconductor in response to externally applied arbitrary thermal gradient VT (nonlinear Seebeck effect) is considered within a model of 3D Josephson junction arrays. For VT > (VT)C, where (VT)C is estimated to be of the order of ~ 104 K/m for YBCO ceramics with an average grain's size d ~ 10 μ m, the weak-links-dominated thermopower S is predicted to become strongly VT-dependent.