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Abstract:
A sensitive differential ac technique has been used to measure the
specific heat of low-T c single-crystal Tl 2Ba 2CuO 6+delta (T cap15 K)
in fields up to 7 T applied parallel to the c axis. In contrast to
high-T c cuprates where a magnetic field substantially broadens the
resistive transition, in these low-T c samples, the field simply shifts
the transition to lower temperatures leaving its width unchanged. Our
specific-heat results, however, show a quite different behavior. The
superconducting anomaly is dramatically reduced in size and broadened by
the field, suggesting, in analogy with other cuprates,the presence of
strong thermal-fluctuation effects.
