Interactions in the bond-frustrated helimagnet ZnCr2Se4 investigated by NMR

Sejun Park; Sangil Kwon; Soonchil Lee; Seunghyun Khim; Dilip Bhoi; Chang Bae Park; Kee Hoon Kim

doi:10.1038/s41598-019-52962-4

Interactions in the bond-frustrated helimagnet ZnCr₂Se₄ investigated by NMR

Sejun Park
, Sangil Kwon
, Soonchil Lee
, Seunghyun Khim
, Dilip Bhoi
, Chang Bae Park
, Kee Hoon Kim

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

7 Scopus citations

Abstract

The zero field ⁵³Cr nuclear magnetic resonance was measured at low temperatures to investigate the interactions in the bond-frustrated S = 3/2 Heisenberg helimagnet ZnCr₂Se₄. A quadratic decrease of the sublattice magnetization was determined from the temperature dependence of the isotropic hyperfine field. We calculated the magnetization using linear spin wave theory for the incommensurate spiral spin order and compared this outcome with experimental results to estimate the coupling constants. The hyperfine fields at Cr and Se ions provide evidences that the spin polarization of Cr ions is transferred to neighboring Se ions due to the covalent bonding between them, resulting in reduced magnetic moment in the Cr ion. This observation indicates that the Jahn-Teller effect, which leads to distortion inducing spin-lattice coupling, is not completely missing in ZnCr₂Se₄.

Original language	English
Article number	16627
Journal	Scientific Reports
Volume	9
Issue number	1
DOIs	https://doi.org/10.1038/s41598-019-52962-4
State	Published - Dec 1 2019
Externally published	Yes

Funding

This work was supported by the National Research Foundation under grants 2019R1F1A1051982 and 2016R1A5A1008184. Work at SNU was financially supported by HYU-HPSTAR-CIS High Pressure Research Center (NRF-2016K1A4A3914691) and Korea Institute of Energy Technology Evaluation and Planning (20173010012940).

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title = "Interactions in the bond-frustrated helimagnet ZnCr2Se4 investigated by NMR",

abstract = "The zero field 53Cr nuclear magnetic resonance was measured at low temperatures to investigate the interactions in the bond-frustrated S = 3/2 Heisenberg helimagnet ZnCr2Se4. A quadratic decrease of the sublattice magnetization was determined from the temperature dependence of the isotropic hyperfine field. We calculated the magnetization using linear spin wave theory for the incommensurate spiral spin order and compared this outcome with experimental results to estimate the coupling constants. The hyperfine fields at Cr and Se ions provide evidences that the spin polarization of Cr ions is transferred to neighboring Se ions due to the covalent bonding between them, resulting in reduced magnetic moment in the Cr ion. This observation indicates that the Jahn-Teller effect, which leads to distortion inducing spin-lattice coupling, is not completely missing in ZnCr2Se4.",

author = "Sejun Park and Sangil Kwon and Soonchil Lee and Seunghyun Khim and Dilip Bhoi and Park, \{Chang Bae\} and Kim, \{Kee Hoon\}",

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AU - Park, Sejun

AU - Kwon, Sangil

AU - Lee, Soonchil

AU - Khim, Seunghyun

AU - Bhoi, Dilip

AU - Park, Chang Bae

AU - Kim, Kee Hoon

PY - 2019/12/1

Y1 - 2019/12/1

N2 - The zero field 53Cr nuclear magnetic resonance was measured at low temperatures to investigate the interactions in the bond-frustrated S = 3/2 Heisenberg helimagnet ZnCr2Se4. A quadratic decrease of the sublattice magnetization was determined from the temperature dependence of the isotropic hyperfine field. We calculated the magnetization using linear spin wave theory for the incommensurate spiral spin order and compared this outcome with experimental results to estimate the coupling constants. The hyperfine fields at Cr and Se ions provide evidences that the spin polarization of Cr ions is transferred to neighboring Se ions due to the covalent bonding between them, resulting in reduced magnetic moment in the Cr ion. This observation indicates that the Jahn-Teller effect, which leads to distortion inducing spin-lattice coupling, is not completely missing in ZnCr2Se4.

AB - The zero field 53Cr nuclear magnetic resonance was measured at low temperatures to investigate the interactions in the bond-frustrated S = 3/2 Heisenberg helimagnet ZnCr2Se4. A quadratic decrease of the sublattice magnetization was determined from the temperature dependence of the isotropic hyperfine field. We calculated the magnetization using linear spin wave theory for the incommensurate spiral spin order and compared this outcome with experimental results to estimate the coupling constants. The hyperfine fields at Cr and Se ions provide evidences that the spin polarization of Cr ions is transferred to neighboring Se ions due to the covalent bonding between them, resulting in reduced magnetic moment in the Cr ion. This observation indicates that the Jahn-Teller effect, which leads to distortion inducing spin-lattice coupling, is not completely missing in ZnCr2Se4.

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Interactions in the bond-frustrated helimagnet ZnCr₂Se₄ investigated by NMR

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