• Editors' Suggestion
  • Rapid Communication

Quasiparticle excitations and evidence for superconducting double transitions in monocrystalline U0.97Th0.03Be13

Yusei Shimizu, Shunichiro Kittaka, Shota Nakamura, Toshiro Sakakibara, Dai Aoki, Yoshiya Homma, Ai Nakamura, and Kazushige Machida
Phys. Rev. B 96, 100505(R) – Published 18 September 2017

Abstract

Superconducting (SC) gap symmetry and magnetic response of cubic U0.97Th0.03Be13 are studied by means of high-precision heat-capacity and dc magnetization measurements using a single crystal, in order to address the long-standing question of its second phase transition at Tc2 in the SC state below Tc1. The absence (presence) of an anomaly at Tc2 in the field-cooling (zero-field-cooling) magnetization indicates that this transition is between two different SC states. There is a qualitative difference in the field variation of the transition temperatures; Tc2(H) is isotropic, whereas Tc1(H) exhibits a weak anisotropy between the [001] and [111] directions. In the low-temperature phase below Tc2(H), the angle-resolved heat capacity C(T,H,ϕ) reveals that the gap is fully opened over the Fermi surface, narrowing down the possible gap symmetry.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 16 February 2017
  • Revised 13 July 2017

DOI:https://doi.org/10.1103/PhysRevB.96.100505

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yusei Shimizu*, Shunichiro Kittaka, Shota Nakamura, and Toshiro Sakakibara

  • Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan

Dai Aoki, Yoshiya Homma, and Ai Nakamura

  • Institute for Materials Research (IMR), Tohoku University, Oarai, Ibaraki 311-1313, Japan

Kazushige Machida

  • Department of Physics, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan

  • *Present address: Institute for Materials Research, Tohoku University, Oarai, Ibaraki, 311-1313, Japan; yuseishimizu@imr.tohoku.ac.jp

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 96, Iss. 10 — 1 September 2017

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×