Magnetoelastic coupling and the magnetization plateau in Ba3CoSb2O9

M. Li, A. Zelenskiy, J. A. Quilliam, Z. L. Dun, H. D. Zhou, M. L. Plumer, and G. Quirion
Phys. Rev. B 99, 094408 – Published 6 March 2019

Abstract

High-precision ultrasonic measurements are used to study magnetoelastic coupling as a function of the in-plane magnetic field orientation in the spin-1/2 triangular lattice antiferromagnet Ba3CoSb2O9. The relevance of this coupling in stabilizing the 1/3 magnetization plateau is explored. The analysis indicates that, while the magnetoelastic coupling in Ba3CoSb2O9 is large in comparison to other triangular lattice antiferromagnets, the strength of this coupling is still too small to fully account for the magnetization plateau width in Ba3CoSb2O9. Spin fluctuations are therefore the dominant mechanism inducing and stabilizing the magnetization plateau. Our results also show that the amplitude of the spin fluctuations suddenly drop as the V phase is induced at higher field.

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  • Received 21 September 2018
  • Revised 7 January 2019

DOI:https://doi.org/10.1103/PhysRevB.99.094408

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

M. Li1,2, A. Zelenskiy1, J. A. Quilliam2, Z. L. Dun3, H. D. Zhou3, M. L. Plumer1, and G. Quirion1,2

  • 1Department of Physics and Physical Oceanography, Memorial University, St. John's, Newfoundland, Canada A1B 3X7
  • 2Institut Quantique and Département de Physique, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1
  • 3Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200, USA

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Issue

Vol. 99, Iss. 9 — 1 March 2019

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