Magnetization Process and Collective Excitations in the S=1/2 Triangular-Lattice Heisenberg Antiferromagnet Ba3CoSb2O9

Takuya Susuki, Nobuyuki Kurita, Takuya Tanaka, Hiroyuki Nojiri, Akira Matsuo, Koichi Kindo, and Hidekazu Tanaka
Phys. Rev. Lett. 110, 267201 – Published 24 June 2013

Abstract

We have performed high-field magnetization and electronic spin resonance (ESR) measurements on Ba3CoSb2O9 single crystals, which approximates the two-dimensional (2D) S=1/2 triangular-lattice Heisenberg antiferromagnet. For an applied magnetic field H parallel to the ab plane, the entire magnetization curve including the plateau at one-third of the saturation magnetization (Ms) is in excellent agreement with the results of theoretical calculations except a small step anomaly near (3/5)Ms, indicative of a theoretically undiscovered quantum phase transition. However, for Hc, the magnetization curve exhibits a cusp near Ms/3 owing to the weak easy-plane anisotropy and the 2D quantum fluctuation. From a detailed analysis of the collective ESR modes observed in the ordered state, combined with the magnetization process, we have determined all the magnetic parameters including the interlayer and anisotropic exchange interactions.

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  • Received 17 March 2013

DOI:https://doi.org/10.1103/PhysRevLett.110.267201

© 2013 American Physical Society

Authors & Affiliations

Takuya Susuki1, Nobuyuki Kurita1, Takuya Tanaka2, Hiroyuki Nojiri2, Akira Matsuo3, Koichi Kindo3, and Hidekazu Tanaka1

  • 1Department of Physics, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan
  • 2Institute for Material Research, Tohoku University, Aoba-ku, Sendai 980-8577, Japan
  • 3Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan

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Issue

Vol. 110, Iss. 26 — 28 June 2013

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