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Observation of the orbital quantum dynamics in the spin-12 hexagonal antiferromagnet Ba3CuSb2O9

Yibo Han, Masayuki Hagiwara, Takehito Nakano, Yasuo Nozue, Kenta Kimura, Mario Halim, and Satoru Nakatsuji
Phys. Rev. B 92, 180410(R) – Published 16 November 2015
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Abstract

We have studied orbital dynamics in the spin liquid candidate Ba3CuSb2O9 using multifrequency electron-spin resonance. We prepared two high-quality single crystals. The crystal with a slight copper deficiency shows a structural phase transition at around 200 K due to the cooperative Jahn-Teller effect, accompanied with orbital ordering. In contrast, the crystal with almost perfect stoichiometry shows no orbital ordering down to the lowest temperature of 1.5 K. Dramatic change in the g factor anisotropy as a function of frequency and temperature demonstrates orbital quantum fluctuations at a nearly constant time scale of 100ps below 20 K, evidencing the emergence of an orbital liquid state in this quantum spin liquid compound.

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  • Received 3 March 2015

DOI:https://doi.org/10.1103/PhysRevB.92.180410

©2015 American Physical Society

Authors & Affiliations

Yibo Han1,2, Masayuki Hagiwara1,*, Takehito Nakano3, Yasuo Nozue3, Kenta Kimura4, Mario Halim4, and Satoru Nakatsuji4,5

  • 1Center for Advanced High Magnetic Field Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
  • 2Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China
  • 3Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
  • 4Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
  • 5PRESTO, Japan Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan

  • *hagiwara@ahmf.sci.osaka-u.ac.jp

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Issue

Vol. 92, Iss. 18 — 1 November 2015

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