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Abstract:
BY means of ultrahigh-resolution dilatometry we have studied the linear
expansion coefficients at the superconducting transition for directions
along and perpendicular to the superconducting layers. A pronounced
discontinuity was found along the interlayer direction which corresponds
to an extraordinary large uniaxial-pressure dependence of dT(c)/dp(a)* =
-4.8K/kbar. This indicats a most sensitive coupling between
superconductivity and interlayer spacing in this layered superconductor.