Abstract
The anisotropy is one key parameter in understanding the physics of high temperature superconductors (HTSC). In addition to quantifying the variation of physical properties in different crystal directions, it contributes to strongly enhanced thermal fluctuations, and thereby to the rich variety of new phenomena observed in HTSC. Some examples are the existence of a mixed state solid-to-liquid phase transition (which depending on the amount of disorder can be a melting transition or a glass transition), the sometimes extreme broadening of the resistive transition in magnetic fields, and the strong decrease of the critical current, even far below T c for increasing temperature or magnetic field (see e.g. Cohen and Jensen, 1997).
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