Field evolution of the spin-liquid candidate YbMgGaO4

Sebastian Bachus, Ilia A. Iakovlev, Yuesheng Li, Andreas Wörl, Yoshifumi Tokiwa, Langsheng Ling, Qingming Zhang, Vladimir V. Mazurenko, Philipp Gegenwart, and Alexander A. Tsirlin
Phys. Rev. B 102, 104433 – Published 28 September 2020

Abstract

We report magnetization, heat capacity, thermal expansion, and magnetostriction measurements down to millikelvin temperatures on the triangular antiferromagnet YbMgGaO4. Our data exclude the formation of the distinct 13 plateau phase observed in other triangular antiferromagnets, but reveal plateaulike features in second derivatives of the free energy, magnetic susceptibility, and specific heat, at μ0H=1.02.5 T for Hc and 25 T for Hc. Using Monte Carlo simulations of a realistic spin Hamiltonian, we ascribe these features to nonmonotonic changes in the magnetization and the 12 plateau that is smeared out by the random distribution of exchange couplings in YbMgGaO4.

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  • Received 18 June 2020
  • Revised 20 August 2020
  • Accepted 27 August 2020

DOI:https://doi.org/10.1103/PhysRevB.102.104433

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Sebastian Bachus1,*, Ilia A. Iakovlev1,2, Yuesheng Li1, Andreas Wörl1, Yoshifumi Tokiwa1, Langsheng Ling3, Qingming Zhang4,5, Vladimir V. Mazurenko2, Philipp Gegenwart1, and Alexander A. Tsirlin1,†

  • 1Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany
  • 2Theoretical Physics and Applied Mathematics Department, Ural Federal University, Ekaterinburg 620002, Russia
  • 3High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China
  • 4National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 5School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China

  • *sebastian.bachus@physik.uni-augsburg.de
  • altsirlin@gmail.com

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Issue

Vol. 102, Iss. 10 — 1 September 2020

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