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Positive curvature in the upper critical field of heavy fermion superconductors

✍ Scribed by L.E. De Long; D. Togliatti; G.W. Lehman; W.-K. Kwok; G.W. Crabtree; K.G. Vandervoort; D.G. Hinks

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
498 KB
Volume
163
Category
Article
ISSN
0921-4526

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✦ Synopsis

New data on the upper critical magnetic field of single crystals of URu,Si, show distinct upward curvature for the field H in the tetragonal basal plane, but not for fields along the tetragonal axis. The data for H < 5 T can be explained as a result of the coupling of a multi-component superconducting order parameter with the magnetization of a spin-density wave.

Alternatively, an empirical model successfully applied to UPt, and U,Fe provides an excellent fit of HC2(T) for URu& over the entire experimental temperature (0.4 K < Tc1.5K) and field (0~ H<ST) ranges. Our results imply that unconventional superconductivity may occur over a wide interval of electronic effective mass ratio 20 < m* im, < 200.

πŸ“œ SIMILAR VOLUMES

Upper critical field in heavy fermion sy
Upper critical field in heavy fermion systems
✍ M. Tachiki; T. Koyama; S. Takahashi πŸ“‚ Article πŸ“… 1985 πŸ› Elsevier Science βš– 202 KB

For explaining the peculiar temperature dependence of the upper critical field He2 in UBe13 the following mechanism was considered: The He2 of UBe13 is extremely high at low temperatures and its intensity is comparable to the Kondo temperature in this compound. Therefore, the coherent state itself m