Abstract
The specific heat in the superconducting state of UBe13 shows marked deviations from BCS theory and obeys a T 3 rather than an exponential law at low temperatures. A good description is obtained by the assumption of an Anderson-Brinkman-Morel p-wave superconducting state at all temperatures. The value of the spin-fluctuation parameter deduced is large and consistent with the stability of such a state.
Highlights
The specific heat in the superconducting state of UBe~3 shows marked deviations from BCS theory and obeys a T rather than an exponential law at low temperatures
A good description is obtained by the assumption of an Anderson-Brinkman-Morel p-wave superconducting state at all temperatures
Since the discovery that liquid 3He is a p-wave superfluid at very low temperatures' 4 there has been an added impetus to the search for anisotropic superconducting metals, but there have been no clear candidates among conventional superconductors
Summary
Laboratorium fiir Festkorperphysik, Eidgenossische Technische Hochschule Honggerberg, CH 809-3 Zurich, Switzerland and. Since the discovery that liquid 3He is a p-wave superfluid at very low temperatures' 4 there has been an added impetus to the search for anisotropic superconducting metals, but there have been no clear candidates among conventional superconductors. It has been recognized for some time that certain rare-earth and actinide intermetallic compounds starting with CeA13' are electronic Landau. Fermi liquids at low temperatures with very strongly enhanced specific heat and susceptibility analogous to the normal state of liquid 3He. The recent discovery of superconductivity in such materials has led naturally to the speculation that the analogy to
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