Abstract
Twin boundaries are the cause of important intrinsic pinning effects in the mixed state of high temperature superconductors. However, adjacent twin planes form channels which can guide the vortices with a nevertheless restricted motion. These phenomena have been studied in detail with a specially prepared sample of YBa 2Cu 3O 7−δ (YBCO). The latter is a heavily twinned single crystal containing a single domain i.e. the twin boundaries are parallel throughout the sample. Thus with a temperature gradient applied parallel and then perpendicular to the twin boundaries, one can observe vortex motion in these two directions by measuring the Seebeck and Nernst effects as a function of temperature for both magnetic field polarities. Field inversion is necessary for the separation of the odd and even components of the measured signals to exploit a hitherto unexplored property of the Seebeck and Nernst effects.
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