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Abstract:
Heavy-fermion superconductivity and other cooperative effects have been
explored by thermal expansion, specific heat and ultrasound measurements
on CeCu2Si2 single crystals. Crystals annealed under Cu atmosphere show
sharp superconducting transitions at T(c)max = 0.63 K. At the same
temperature the "as grown", i.e., non-bulk-superconducting, crystals
reveal a pronounced phase-transition anomaly, presumably of structural
origin. This new transition is associated with an expansion of the
volume upon cooling and gives rise to magnetic correlations. Our
results indicate a complex interplay between lattice instability,
magnetic phenomena and superconductivity in CeCu2Si2.
