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

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

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

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Detail(s)

Original languageEnglish
Article number037201
Journal / PublicationPhysical Review Letters
Volume126
Issue number3
Online published19 Jan 2021
Publication statusPublished - 22 Jan 2021

Link(s)

Abstract

Sr2CuTeO6 is a square-lattice Néel antiferromagnet with superexchange between first-neighbor =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.

Research Area(s)

Citation Format(s)

Extreme Suppression of Antiferromagnetic Order and Critical Scaling in a Two-Dimensional Random Quantum Magnet. / Hong, Wenshan; Liu, Lu; Liu, Chang et al.
In: Physical Review Letters, Vol. 126, No. 3, 037201, 22.01.2021.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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