Critical slowing-down and field-dependent paramagnetic fluctuations in the skyrmion host EuPtSi: μSR and NMR studies

N. Higa, T. U. Ito, M. Yogi, T. Hattori, H. Sakai, S. Kambe, Z. Guguchia, W. Higemoto, M. Nakashima, Y. Homma, A. Nakamura, F. Honda, Y. Shimizu, D. Aoki, M. Kakihana, M. Hedo, T. Nakama, Y. Ōnuki, and Y. Tokunaga
Phys. Rev. B 104, 045145 – Published 27 July 2021

Abstract

We report the results of muon spin relaxation (μSR) and Si29 NMR measurements carried out on the cubic chiral magnet EuPtSi. This compound exhibits a helimagnetic transition at TN=4 K, and hosts a unique skyrmion phase characterized by a short modulation period and strong anisotropy under magnetic fields. Our zero-field μSR experiments revealed the development of critical slowing down of Eu spin fluctuations over a relatively wide critical region (TTN)/TN<5 above TN. We also found from Si29 NMR that the spin fluctuations are strongly suppressed by magnetic field in the paramagnetic state above 20 K. These characteristic spin dynamics observed over a wide region of temperature and magnetic field suggest the presence of magnetic frustration in the spin system. Such frustration would underlie the mechanism stabilizing the short-period skyrmion lattice observed in this compound.

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  • Received 2 November 2020
  • Revised 11 May 2021
  • Accepted 30 June 2021

DOI:https://doi.org/10.1103/PhysRevB.104.045145

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

N. Higa1,*, T. U. Ito1, M. Yogi2, T. Hattori1, H. Sakai1, S. Kambe1, Z. Guguchia3, W. Higemoto1, M. Nakashima4, Y. Homma5, A. Nakamura5, F. Honda5, Y. Shimizu5, D. Aoki5, M. Kakihana2, M. Hedo2, T. Nakama2, Y. Ōnuki2, and Y. Tokunaga1

  • 1Advanced Science Research Center, Japan Atomic Energy Agency, Tokai-mura, Ibaraki 319-1195, Japan
  • 2Department of Physics and Earth Sciences, Faculty of Science, University of the Ryukyus, Okinawa 903-0213, Japan
  • 3Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
  • 4Faculty of Science, Shinshu University, Matsumoto, Nagano 390-8621, Japan
  • 5Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan

  • *Present address: Department of Quantum Matter, AdSM, Hiroshima University, Higashihiroshima, Hiroshima 739-8530, Japan.

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Vol. 104, Iss. 4 — 15 July 2021

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