Specific-Heat Measurements on UBe13 under Uniaxial Pressure

Reinders, P. H. P.; Wand, B.; Steglich, F.; Fraunberger, G.; Stewart, G. R.; Adrian, G.

doi:10.1209/0295-5075/25/8/010

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Specific-Heat Measurements on UBe₁₃ under Uniaxial Pressure

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Reinders, P. H. P., Wand, B., Steglich, F., Fraunberger, G., Stewart, G. R., & Adrian, G. (1994). Specific-Heat Measurements on UBe₁₃ under Uniaxial Pressure. EPL, 25(8), 619-624. doi:10.1209/0295-5075/25/8/010.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-DD78-F

Abstract

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.