Extreme Suppression of Antiferromagnetic Order and Critical Scaling in a Two-Dimensional Random Quantum Magnet

Wenshan Hong; Lu Liu; Chang Liu; Xiaoyan Ma; Akihiro Koda; Xin Li; Jianming Song; Wenyun Yang; Jinbo Yang; Peng Cheng; Hongxia Zhang; Wei Bao; Xiaobai Ma; Dongfeng Chen; Kai Sun; Wenan Guo; Huiqian Luo; Anders W. Sandvik; Shiliang Li

doi:10.1103/PhysRevLett.126.037201

Extreme Suppression of Antiferromagnetic Order and Critical Scaling in a Two-Dimensional Random Quantum Magnet

Wenshan Hong
, Lu Liu
, Chang Liu
, Xiaoyan Ma
, Akihiro Koda
, Xin Li
, Jianming Song
, Wenyun Yang
, Jinbo Yang
, Peng Cheng
, Hongxia Zhang
, Wei Bao
, Xiaobai Ma
, Dongfeng Chen
, Kai Sun
, Wenan Guo
, Huiqian Luo
, Anders W. Sandvik
, Shiliang Li

Department of Physics

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

31 Citations (Scopus)

33 Downloads (CityUHK Scholars)

Abstract

Sr₂CuTeO₆ is a square-lattice Néel antiferromagnet with superexchange between first-neighbor S =1/2 Cu spins mediated by plaquette centered Te ions. Substituting Te by W, the affected impurity plaquettes have predominantly second-neighbor interactions, thus causing local magnetic frustration. Here we report a study of Sr₂CuTe_1-xW_xO₆ using neutron diffraction and μSR techniques, showing that the Néel order vanishes already at x=0.025±0.005. We explain this extreme order suppression using a two-dimensional Heisenberg spin model, demonstrating that a W-type impurity induces a deformation of the order parameter that decays with distance as 1/r² at temperature T=0. The associated logarithmic singularity leads to loss of order for any x>0. Order for small x>0 and T>0 is induced by weak interplane couplings. In the nonmagnetic phase of Sr₂CuTe_1-xW_xO₆, the μSR relaxation rate exhibits quantum critical scaling with a large dynamic exponent, z≈3, consistent with a random-singlet state.

Original language	English
Article number	037201
Journal	Physical Review Letters
Volume	126
Issue number	3
Online published	19 Jan 2021
DOIs	https://doi.org/10.1103/PhysRevLett.126.037201
Publication status	Published - 22 Jan 2021

Publisher's Copyright Statement

COPYRIGHT TERMS OF DEPOSITED FINAL PUBLISHED VERSION FILE: Hong, W., Liu, L., Liu, C., Ma, X., Koda, A., Li, X., Song, J., Yang, W., Yang, J., Cheng, P., Zhang, H., Bao, W., Ma, X., Chen, D., Sun, K., Guo, W., Luo, H., Sandvik, A. W., & Li, S. (2021). Extreme Suppression of Antiferromagnetic Order and Critical Scaling in a Two-Dimensional Random Quantum Magnet. Physical Review Letters, 126(3), Article 037201. https://doi.org/10.1103/PhysRevLett.126.037201 The copyright of this article is owned by American Physical Society.

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Hong, W., Liu, L., Liu, C., Ma, X., Koda, A., Li, X., Song, J., Yang, W., Yang, J., Cheng, P., Zhang, H., Bao, W., Ma, X., Chen, D., Sun, K., Guo, W., Luo, H., Sandvik, A. W., & Li, S. (2021). Extreme Suppression of Antiferromagnetic Order and Critical Scaling in a Two-Dimensional Random Quantum Magnet. Physical Review Letters, 126(3), Article 037201. https://doi.org/10.1103/PhysRevLett.126.037201

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title = "Extreme Suppression of Antiferromagnetic Order and Critical Scaling in a Two-Dimensional Random Quantum Magnet",

abstract = "Sr2CuTeO6 is a square-lattice N{\'e}el antiferromagnet with superexchange between first-neighbor S =1/2 Cu spins mediated by plaquette centered Te ions. Substituting Te by W, the affected impurity plaquettes have predominantly second-neighbor interactions, thus causing local magnetic frustration. Here we report a study of Sr2CuTe1-xWxO6 using neutron diffraction and μSR techniques, showing that the N{\'e}el order vanishes already at x=0.025±0.005. We explain this extreme order suppression using a two-dimensional Heisenberg spin model, demonstrating that a W-type impurity induces a deformation of the order parameter that decays with distance as 1/r2 at temperature T=0. The associated logarithmic singularity leads to loss of order for any x>0. Order for small x>0 and T>0 is induced by weak interplane couplings. In the nonmagnetic phase of Sr2CuTe1-xWxO6, the μSR relaxation rate exhibits quantum critical scaling with a large dynamic exponent, z≈3, consistent with a random-singlet state.",

author = "Wenshan Hong and Lu Liu and Chang Liu and Xiaoyan Ma and Akihiro Koda and Xin Li and Jianming Song and Wenyun Yang and Jinbo Yang and Peng Cheng and Hongxia Zhang and Wei Bao and Xiaobai Ma and Dongfeng Chen and Kai Sun and Wenan Guo and Huiqian Luo and Sandvik, \{Anders W.\} and Shiliang Li",

year = "2021",

month = jan,

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doi = "10.1103/PhysRevLett.126.037201",

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Hong, W, Liu, L, Liu, C, Ma, X, Koda, A, Li, X, Song, J, Yang, W, Yang, J, Cheng, P, Zhang, H, Bao, W, Ma, X, Chen, D, Sun, K, Guo, W, Luo, H, Sandvik, AW & Li, S 2021, 'Extreme Suppression of Antiferromagnetic Order and Critical Scaling in a Two-Dimensional Random Quantum Magnet', Physical Review Letters, vol. 126, no. 3, 037201. https://doi.org/10.1103/PhysRevLett.126.037201

TY - JOUR

T1 - Extreme Suppression of Antiferromagnetic Order and Critical Scaling in a Two-Dimensional Random Quantum Magnet

AU - Hong, Wenshan

AU - Liu, Lu

AU - Liu, Chang

AU - Ma, Xiaoyan

AU - Koda, Akihiro

AU - Li, Xin

AU - Song, Jianming

AU - Yang, Wenyun

AU - Yang, Jinbo

AU - Cheng, Peng

AU - Zhang, Hongxia

AU - Bao, Wei

AU - Ma, Xiaobai

AU - Chen, Dongfeng

AU - Sun, Kai

AU - Guo, Wenan

AU - Luo, Huiqian

AU - Sandvik, Anders W.

AU - Li, Shiliang

PY - 2021/1/22

Y1 - 2021/1/22

N2 - Sr2CuTeO6 is a square-lattice Néel antiferromagnet with superexchange between first-neighbor S =1/2 Cu spins mediated by plaquette centered Te ions. Substituting Te by W, the affected impurity plaquettes have predominantly second-neighbor interactions, thus causing local magnetic frustration. Here we report a study of Sr2CuTe1-xWxO6 using neutron diffraction and μSR techniques, showing that the Néel order vanishes already at x=0.025±0.005. We explain this extreme order suppression using a two-dimensional Heisenberg spin model, demonstrating that a W-type impurity induces a deformation of the order parameter that decays with distance as 1/r2 at temperature T=0. The associated logarithmic singularity leads to loss of order for any x>0. Order for small x>0 and T>0 is induced by weak interplane couplings. In the nonmagnetic phase of Sr2CuTe1-xWxO6, the μSR relaxation rate exhibits quantum critical scaling with a large dynamic exponent, z≈3, consistent with a random-singlet state.

AB - Sr2CuTeO6 is a square-lattice Néel antiferromagnet with superexchange between first-neighbor S =1/2 Cu spins mediated by plaquette centered Te ions. Substituting Te by W, the affected impurity plaquettes have predominantly second-neighbor interactions, thus causing local magnetic frustration. Here we report a study of Sr2CuTe1-xWxO6 using neutron diffraction and μSR techniques, showing that the Néel order vanishes already at x=0.025±0.005. We explain this extreme order suppression using a two-dimensional Heisenberg spin model, demonstrating that a W-type impurity induces a deformation of the order parameter that decays with distance as 1/r2 at temperature T=0. The associated logarithmic singularity leads to loss of order for any x>0. Order for small x>0 and T>0 is induced by weak interplane couplings. In the nonmagnetic phase of Sr2CuTe1-xWxO6, the μSR relaxation rate exhibits quantum critical scaling with a large dynamic exponent, z≈3, consistent with a random-singlet state.

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U2 - 10.1103/PhysRevLett.126.037201

DO - 10.1103/PhysRevLett.126.037201

M3 - RGC 21 - Publication in refereed journal

SN - 0031-9007

VL - 126

JO - Physical Review Letters

JF - Physical Review Letters

IS - 3

M1 - 037201

ER -

Extreme Suppression of Antiferromagnetic Order and Critical Scaling in a Two-Dimensional Random Quantum Magnet

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