Orbital crossing in spin-split Fermi surfaces and anisotropic effective mass of the noncentrosymmetric heavy-fermion paramagnet UPt5

Yoshiki J. Sato, Hisatomo Harima, Ai Nakamura, Arvind Maurya, Yusei Shimizu, Yoshiya Homma, Dexin Li, Fuminori Honda, Dai Aoki

Research output: Contribution to journalArticlepeer-review

Abstract

We report the single-crystal growth of the noncentrosymmetric cubic heavy-fermion paramagnet UPt5 and comparative Fermi surface studies of de Haas-van Alphen (dHvA) experiments and theoretical band calculations. We also present the results of single-crystal x-ray diffraction, electrical resistivity, heat capacity, and magnetization measurements using single crystals of UPt5. The dHvA experiments reveal nearly spherical split hole Fermi surfaces and largely split electron Fermi surfaces, which are in agreement with the results of a band-structure calculation. The largely split electron Fermi surfaces may be understood through the antisymmetric spin-orbit interaction derived from U-5f and Pt-5d electrons. We explain the observed unexpected dHvA frequencies quasiquantitatively based on orbital crossing using the coupled network analysis in the split hole Fermi surface pair. Furthermore, the temperature dependence of the dHvA amplitude reveals enhanced cyclotron effective masses of up to 29m0 and a peculiar anisotropic effective mass in the paramagnetic cubic heavy-fermion UPt5.

Original languageEnglish
Article number125114
JournalPhysical Review B
Volume102
Issue number12
DOIs
Publication statusPublished - Sep 2020
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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