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Evidence of Electromagnetic Absorption by Collective Modes in the Heavy Fermion Superconductor UBe13

J. R. Feller, C. -C. Tsai, J. B. Ketterson, J. L. Smith, Bimal K. Sarma

cond-mat.supr-conarXiv:cond-mat/0104445

Abstract

We present results of a microwave surface impedance study of the heavy fermion superconductor UBe13. We clearly observe an absorption peak whose frequency- and temperature-dependence scales with the BCS gap function. Resonant absorption into a collective mode, with energy approximately proportional to the superconducting gap, is proposed as a possible explantation.

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