Field-orientation dependence of low-energy quasiparticle excitations in the heavy-electron superconductor UBe13

Yusei Shimizu, Shunichiro Kittaka, Toshiro Sakakibara, Yoshinori Haga, Etsuji Yamamoto, Hiroshi Amitsuka, Yasumasa Tsutsumi, Kazushige Machida

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29 Citations (Scopus)

Abstract

Low-energy quasiparticle excitations in the superconducting (SC) state of UBe13 were studied by means of specific-heat (C) measurements in a rotating field. Quite unexpectedly, the magnetic-field dependence of C(H) is linear in H with no angular dependence at low fields in the SC state, implying that the gap is fully open over the Fermi surfaces, in stark contrast to previous expectations. In addition, a characteristic cubic anisotropy of C(H) was observed above 2 T with a maximum (minimum) for H∥[001] ([111]) within the (11¯0) plane, in the normal as well as in the SC states. This oscillation possibly originates from the anisotropic response of the heavy quasiparticle bands, and might be a key to understand the unusual properties of UBe13.

Original languageEnglish
Article number147002
JournalPhysical review letters
Volume114
Issue number14
DOIs
Publication statusPublished - 2015 Apr 7
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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