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

doi:10.1103/PhysRevB.98.014425

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

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

2 Citations (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 language	English
Article number	014425
Journal	Physical Review B
Volume	98
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.98.014425
Publication status	Published - Jul 23 2018
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.98.014425

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

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.",

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

note = "Funding Information: We would like to thank R. E. Walstedt for valuable discussions and a critical reading of our manuscript. A part of this work was supported by JSPS KAKENHI [Grants No. JP15KK0174, No. JP15H05745, No. JP15H05884 (J-Physics), and No. JP16H04006], ICC-IMR, and the REIMEI Research Program of JAEA. Publisher Copyright: {\textcopyright} 2018 American Physical Society.",

year = "2018",

month = jul,

day = "23",

doi = "10.1103/PhysRevB.98.014425",

language = "English",

volume = "98",

journal = "Physical Review B",

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T1 - Easy-plane XY spin fluctuations in the cycloidal magnet UPtGe studied via field-orientation-dependent Pt 195 NMR

AU - Tokunaga, Y.

AU - Nakamura, A.

AU - Aoki, D.

AU - Shimizu, Y.

AU - Homma, Y.

AU - Honda, F.

AU - Sakai, H.

AU - Hattori, T.

AU - Kambe, S.

N1 - Funding Information: We would like to thank R. E. Walstedt for valuable discussions and a critical reading of our manuscript. A part of this work was supported by JSPS KAKENHI [Grants No. JP15KK0174, No. JP15H05745, No. JP15H05884 (J-Physics), and No. JP16H04006], ICC-IMR, and the REIMEI Research Program of JAEA. Publisher Copyright: © 2018 American Physical Society.

PY - 2018/7/23

Y1 - 2018/7/23

N2 - 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.

AB - 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.

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ER -

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

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