Abstract
We report the far-infrared properties of superconducting ab plane-oriented YBa 2Cu 3O 7- δ films in magnetic fields of up to 27 T. The applications of magnetic field (with H perpendicular to the ab plane and with unpolarized light) at low temperature produces no discernible field dependence. This observation differs from other previous far-infrared measurements in this temperature range. Only at fields and temperatures where the dc resistance is not zero – on account of dissipative flux motion – is a field-induced effect observed.
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