Easy-plane XY spin fluctuations in the cycloidal magnet UPtGe studied via field-orientation-dependent Pt 195 NMR

Y. Tokunaga, A. Nakamura, D. Aoki, Y. Shimizu, Y. Homma, F. Honda, H. Sakai, T. Hattori, S. Kambe

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1 Citation (Scopus)

Abstract

Pt195 NMR measurements have been performed on a single crystal of the uranium-based compound UPtGe, which is the only 5f system known to possess an incommensurate helical (cycloidal) structure below TN=50 K. Knight shift measurement confirmed the isotropic character of the static spin susceptibilities in hexagonal-like ac crystal planes of the EuAuGe-type crystal structure. The hyperfine coupling constants were also found to be isotropic in the planes, estimated to be 59 kOe/μB. Nuclear relaxation rate (1/T1) measurement revealed the development of the antiferromagnetic spin fluctuations with XY character confined to the hexagonal-like plane below 200 K. The results present a clear contrast to the Ising anisotropy of the fluctuations in ferromagnetic superconductors UCoGe and URhGe.

Original languageEnglish
Article number014425
JournalPhysical Review B
Volume98
Issue number1
DOIs
Publication statusPublished - Jul 23 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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