Field-Orientation Dependence of Low-Energy Quasiparticle Excitations in the Heavy-Electron Superconductor UBe13

被引：30

作者：

Shimizu, Yusei ^{[1
]}

Kittaka, Shunichiro ^{[1
]}

Sakakibara, Toshiro ^{[1
]}

Haga, Yoshinori ^{[2
]}

Yamamoto, Etsuji ^{[2
]}

Amitsuka, Hiroshi ^{[3
]}

Tsutsumi, Yasumasa ^{[4
]}

Machida, Kazushige ^{[5
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

[2] Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan

[3] Hokkaido Univ, Grad Sch Sci, Sapporo, Hokkaido 0600810, Japan

[4] RIKEN, Condensed Matter Theory Lab, Wako, Saitama 3510198, Japan

[5] Okayama Univ, Dept Phys, Okayama 7008530, Japan

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 114卷 / 14期

关键词：

MAGNETIC-RESONANCE; FERMI-SURFACE; NORMAL-STATE; PHASE; SYSTEM; THERMODYNAMICS;

D O I：

10.1103/PhysRevLett.114.147002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 parallel to[001] ([111]) within the (1 (1) over bar0) 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

引用

页数：6

共 22 条

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