Abstract
Dilatation measurements have been performed on a single-crystalline sample of the heavy-fermion superconductor URu 2Si 2 ( T c = 1.2 K).Thermal expansion measurements indicate a thermal electronic Grüneisen parameter Γ T = 27. A comparison with the magnetic electronic Grüneisen parameter derived from the magnetostriction, Γ B = 26, points to a single energy scale. Magnetostriction measurements in the superconducting state reveal hysteresis with a peculiar change of sign close to the upper critical field, B c2.
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