Abstract
Abstract The specific heat of an amorphous superconductor Zr 3 Rh (T c = 4.3 K ) has been measured in the temperature range from 0.35 K to 10 K and with an applied magnetic field of 75 kG. The high field suppresses superconductivity and allows accurate determination of the phonon (βT 3 ) term for the lowest temperatures studied. A careful subtraction of the normal electronic specific heat (γT) and phonon terms reveals a well defined excess linear heat capacity γ'T at low temperature. This excess term is attributed to localized lattice excitations using the two-level tunneling defect model of Phillips.
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