Abstract
We have measured the specific heat C of a polycrystalline sample of the non-cuprate superconductor Ba 0.6K 0.4BiO 3 ( T c ≈ 27K) from T = 1.8 K down to T = 0.1 K. The data could be fitted accurately to the expression C = AT −2 + αT n + βT 3 where n = 0.53 ± 0.10. The nuclear term ( AT −2) is attributed to the presence of a crystalline electric field gradient on the Bi nuclei. The residual specific heat term ( αT n) has also been observed in the low temperature specific heat of several cuprate high- T c superconductors (0.3 ≤ n ≤ 1) suggesting a possible common origin in all of these systems.
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