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The superconducting phases of UPt3

✍ Scribed by H.v. Löhneysen

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
844 KB
Volume
197
Category
Article
ISSN
0921-4526

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✦ Synopsis

The heavy-fermion superconductor UPt 3 shows many indications of unconventional superconductivity. In particular, the multiplicity of superconducting phases calls for an explanation in terms of a multi-component order parameter. As will be reviewed in this article, these phases have been mapped out recently by a number of different measurements. The existence of a tetracritical point in the field-temperature (B, T) plane for B _1_ c and B II c is consistent with thermodynamic constraints. The specific heat under pressure indicates a strong relation between superconductivity and the weak antiferromagnetic order. The recent observation of a structural modulation and its influence on superconductivity will also be discussed. Finally, point-contact spectroscopy on UPt 3 shows a strong anisotropy of Andreev reflection which, together with an unusual temperature and magnetic-field dependence, further supports the notion of unconventional superconductivity in this material. In particular, the different superconducting phases of UPt 3 have different order-parameter components.

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