Superconducting symmetries and magnetic responses of uranium heavy-fermion systems UBe13 and UPd2Al3

Yusei Shimizu, Shunichiro Kittaka, Toshiro Sakakibara, Dai Aoki

Research output: Contribution to journalArticlepeer-review

Abstract

Low-temperature thermodynamic investigation for UBe13 and UPd2Al3 were performed in order to gain insight into their unusual ground states of 5f electrons. Our heat-capacity data for the cubic UBe13 strongly suggest that nodal quasiparticles are absent and its superconducting (SC) gap is fully open over the Fermi surface. Moreover, two unusual thermodynamic anomalies are also observed in UBe13 at ∼ 3 T and ∼ 9 T; the lower-field anomaly is seen only in the SC mixed state by dc magnetization M(H) as well as heat-capacity C(H), while the higher-field anomaly appears for C(H) in the normal phase above the upper critical field. On the other hand, field-orientation dependence of the heat capacity in the hexagonal UPd2Al3 shows a significantly anisotropic behavior of C(H)∝H1/2, reflecting the nodal gap structure of this system. Our result strongly suggests the presence of a horizontal line node on the Fermi surface with heavy effective mass in UPd2Al3.

Original languageEnglish
Pages (from-to)553-557
Number of pages5
JournalPhysica B: Condensed Matter
Volume536
DOIs
Publication statusPublished - 2018 May 1

Keywords

  • Heavy-Fermion superconductivity
  • Superconducting symmetry
  • UBe
  • UPdAl

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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