Critical slowing-down and field-dependent paramagnetic fluctuations in the skyrmion host EuPtSi: 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; Y. Tokunaga

doi:10.1103/PhysRevB.104.045145

Critical slowing-down and field-dependent paramagnetic fluctuations in the skyrmion host EuPtSi: 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, Y. Tokunaga

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Abstract

We report the results of muon spin relaxation () and NMR measurements carried out on the cubic chiral magnet EuPtSi. This compound exhibits a helimagnetic transition at K, and hosts a unique skyrmion phase characterized by a short modulation period and strong anisotropy under magnetic fields. Our zero-field experiments revealed the development of critical slowing down of Eu spin fluctuations over a relatively wide critical region above . We also found from 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.

Original language	English
Article number	045145
Journal	Physical Review B
Volume	104
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevB.104.045145
Publication status	Published - Jul 15 2021
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.104.045145

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Higa, N., Ito, T. U., Yogi, M., Hattori, T., Sakai, H., Kambe, S., Guguchia, Z., Higemoto, W., Nakashima, M., Homma, Y., Nakamura, A., Honda, F., Shimizu, Y., Aoki, D., Kakihana, M., Hedo, M., Nakama, T., Ōnuki, Y., & Tokunaga, Y. (2021). Critical slowing-down and field-dependent paramagnetic fluctuations in the skyrmion host EuPtSi: and NMR studies. Physical Review B, 104(4), [045145]. https://doi.org/10.1103/PhysRevB.104.045145

Critical slowing-down and field-dependent paramagnetic fluctuations in the skyrmion host EuPtSi : and NMR studies. / Higa, N.; Ito, T. U.; Yogi, M.; Hattori, T.; Sakai, H.; Kambe, S.; Guguchia, Z.; Higemoto, W.; Nakashima, M.; Homma, Y.; Nakamura, A.; Honda, F.; Shimizu, Y.; Aoki, D.; Kakihana, M.; Hedo, M.; Nakama, T.; Ōnuki, Y.; Tokunaga, Y.

In: Physical Review B, Vol. 104, No. 4, 045145, 15.07.2021.

Research output: Contribution to journal › Article › peer-review

Higa, N, Ito, TU, Yogi, M, Hattori, T, Sakai, H, Kambe, S, Guguchia, Z, Higemoto, W, Nakashima, M, Homma, Y, Nakamura, A, Honda, F, Shimizu, Y, Aoki, D, Kakihana, M, Hedo, M, Nakama, T, Ōnuki, Y & Tokunaga, Y 2021, 'Critical slowing-down and field-dependent paramagnetic fluctuations in the skyrmion host EuPtSi: and NMR studies', Physical Review B, vol. 104, no. 4, 045145. https://doi.org/10.1103/PhysRevB.104.045145

Higa, N. ; Ito, T. U. ; Yogi, M. ; Hattori, T. ; Sakai, H. ; Kambe, S. ; Guguchia, Z. ; Higemoto, W. ; Nakashima, M. ; Homma, Y. ; Nakamura, A. ; Honda, F. ; Shimizu, Y. ; Aoki, D. ; Kakihana, M. ; Hedo, M. ; Nakama, T. ; Ōnuki, Y. ; Tokunaga, Y. / Critical slowing-down and field-dependent paramagnetic fluctuations in the skyrmion host EuPtSi : and NMR studies. In: Physical Review B. 2021 ; Vol. 104, No. 4.

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title = "Critical slowing-down and field-dependent paramagnetic fluctuations in the skyrmion host EuPtSi: and NMR studies",

abstract = "We report the results of muon spin relaxation () and NMR measurements carried out on the cubic chiral magnet EuPtSi. This compound exhibits a helimagnetic transition at K, and hosts a unique skyrmion phase characterized by a short modulation period and strong anisotropy under magnetic fields. Our zero-field experiments revealed the development of critical slowing down of Eu spin fluctuations over a relatively wide critical region above . We also found from 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.",

author = "N. Higa and Ito, {T. U.} and M. Yogi and T. Hattori and H. Sakai and S. Kambe and Z. Guguchia and W. Higemoto and M. Nakashima and Y. Homma and A. Nakamura and F. Honda and Y. Shimizu and D. Aoki and M. Kakihana and M. Hedo and T. Nakama and Y. Ōnuki and Y. Tokunaga",

note = "Funding Information: The authors would like to thank T. Matsumura and R. E. Walstedt for the critical reading of the manuscript. The experiments at J-PARC and PSI were performed under the user programs J-PARC Proposal No. 2018A0089 and PSI Proposal No. 20190228. Part of the work was supported by the Japan Society for the Promotion of Science KAKENHI: J-Physics (Grants No. JP15K21732 and No. JP15H05884) and Grants-in-Aid for Scientific Research (B) and (C) (Grants No. 20H01864 and No. 20K12484). Publisher Copyright: {\textcopyright}2021 American Physical Society",

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AU - Higa, N.

AU - Ito, T. U.

AU - Yogi, M.

AU - Hattori, T.

AU - Sakai, H.

AU - Kambe, S.

AU - Guguchia, Z.

AU - Higemoto, W.

AU - Nakashima, M.

AU - Homma, Y.

AU - Nakamura, A.

AU - Honda, F.

AU - Shimizu, Y.

AU - Aoki, D.

AU - Kakihana, M.

AU - Hedo, M.

AU - Nakama, T.

AU - Ōnuki, Y.

AU - Tokunaga, Y.

N1 - Funding Information: The authors would like to thank T. Matsumura and R. E. Walstedt for the critical reading of the manuscript. The experiments at J-PARC and PSI were performed under the user programs J-PARC Proposal No. 2018A0089 and PSI Proposal No. 20190228. Part of the work was supported by the Japan Society for the Promotion of Science KAKENHI: J-Physics (Grants No. JP15K21732 and No. JP15H05884) and Grants-in-Aid for Scientific Research (B) and (C) (Grants No. 20H01864 and No. 20K12484). Publisher Copyright: ©2021 American Physical Society

PY - 2021/7/15

Y1 - 2021/7/15

N2 - We report the results of muon spin relaxation () and NMR measurements carried out on the cubic chiral magnet EuPtSi. This compound exhibits a helimagnetic transition at K, and hosts a unique skyrmion phase characterized by a short modulation period and strong anisotropy under magnetic fields. Our zero-field experiments revealed the development of critical slowing down of Eu spin fluctuations over a relatively wide critical region above . We also found from 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.

AB - We report the results of muon spin relaxation () and NMR measurements carried out on the cubic chiral magnet EuPtSi. This compound exhibits a helimagnetic transition at K, and hosts a unique skyrmion phase characterized by a short modulation period and strong anisotropy under magnetic fields. Our zero-field experiments revealed the development of critical slowing down of Eu spin fluctuations over a relatively wide critical region above . We also found from 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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Critical slowing-down and field-dependent paramagnetic fluctuations in the skyrmion host EuPtSi: and NMR studies

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