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Abstract:
We have performed high-magnetic-field, to 16 T, low-temperature
specific-heat measurements for CeCu2.2Si2, CeCu2Si2, and CeCu1.9Si2. The
first two materials, which are superconducting, exhibit a pronounced
structure in C/T at T is similar to 0.6 K and H greater-than-or-equal 10
T. Changing the field from 10 to 16 T does not affect the anomaly. The
nonsuperconducting, CeCu1.9Si2, sample does not exhibit a similar
anomaly in the investigated temperature range, 0.32-1 K. Possible
correlations between this structure and the low-temperature, high-field
phase diagram of CeCu2Si2 are discussed.
