Anisotropic magnetic fluctuations in ferromagnetic superconductor UGe2: 73Ge-NQR study at ambient pressure

Yuichiro Noma, Hisashi Kotegawa, Tetsuro Kubo, Hideki Tou, Hisatomo Harima, Yoshinori Haga, Etsuji Yamamoto, Yoshichika Ōnuki, Kohei M Itoh, Eugene E. Haller, Ai Nakamura, Yoshiya Homma, Fuminori Honda, Dai Aoki

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3 Citations (Scopus)

Abstract

We report a 73Ge nuclear quadrupole resonance reinvestigation of the ferromagnetic (FM) superconductor UGe2 at ambient pressure. Careful measurement and analysis of the paramagnetic (PM) spectrum taking into account the calculated electric field gradient (EFG) resulted in modification of the previously reported site assignments for three inequivalent Ge sites. The crossover anomaly at Tx in the FM state is not clearly seen in the temperature dependence of the static internal field at the Ge site, whereas it appears in the nuclear spin–lattice relaxation rate, 1/T1. A remarkable site dependence of 1/T1 is observed among the inequivalent Ge sites, where the directions of the principal axes of the EFG are different. This result reveals that the magnetic fluctuation of UGe2 is highly anisotropic, which is consistent with the presence of Ising magnetic fluctuations in the PM state.

Original languageEnglish
Article number033704
JournalJournal of the Physical Society of Japan
Volume87
Issue number3
DOIs
Publication statusPublished - 2018 Jan 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Noma, Y., Kotegawa, H., Kubo, T., Tou, H., Harima, H., Haga, Y., Yamamoto, E., Ōnuki, Y., Itoh, K. M., Haller, E. E., Nakamura, A., Homma, Y., Honda, F., & Aoki, D. (2018). Anisotropic magnetic fluctuations in ferromagnetic superconductor UGe2: 73Ge-NQR study at ambient pressure. Journal of the Physical Society of Japan, 87(3), [033704]. https://doi.org/10.7566/JPSJ.87.033704