Heat-capacity measurements of the critical coupling between aluminum grains

T. Worthington, P. Lindenfeld, G. Deutscher

Research output: Contribution to journalArticlepeer-review


We have measured the heat capacity of granular aluminum specimens with normal-state resistivities N between 0.6×10-3 and 40 × 10-3 cm. The specimens become superconducting with a heat-capacity transition which is BCS-like for the lowest N, and then diminishes until it is no longer observable for the highest N. We conclude that the grains become decoupled such that, because of their small size, they do not exhibit bulk superconductivity when they are isolated.

Original languageEnglish
Pages (from-to)316-319
Number of pages4
JournalPhysical Review Letters
Issue number5
StatePublished - 1978


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