Abstract
The occurrence of a superconducting state in ..beta..-(ET)/sub 2/AuI/sub 2/ was detected by rf penetration depth measurements at ambient pressure and at various applied magnetic fields, similar to measurements previously reported for the I/sub 3//sup -/ and IBr/sub 2//sup -/ derivatives. The change in resonant frequency as a function of temperature at zero applied magnetic field was determined for a sample consisting of three relatively large single crystals. This sample gave an apparent onset temperature for bulk superconductivity (T/sub c/) of 4.97 +/- 0.06 K, which is the highest T/sub c/ yet observed at ambient pressure for an organic superconductor. 21 references, 1 figure.
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