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Schlagwörter:
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Zusammenfassung:
We have investigated the superconducting ground state of a high-quality
UBe13 single crystal under uniaxial pressure along the [110] axis.
Uniaxial pressure is expected to break the cubic symmetry and, perhaps,
to remove orbital degeneracies associated with a multidimensional order
parameter. However, our specific-heat measurements reveal no splitting
of the superconducting transition at T(c) up to 6.8 kbar. Both T(c)
(congruent-to 0.72 K) and the Sommerfeld coefficient gamma(congruent-to
1 J/k2 mole) decrease with increasing pressure, but the slopes disagree
with the 1/3 rule of the hydrostatic values, as determined for
polycrystalline samples.
