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Title: Magnetic excitations in the spin-1/2 triangular-lattice antiferromagnet Cs2CuBr4

We present on high- field electron spin resonance (ESR) studies of magnetic excitations in the spin- 1/2 triangular-lattice antiferromagnet Cs2CuBr4. Frequency- field diagrams of ESR excitations are measured for different orientations of magnetic fields up to 25 T. We show that the substantial zero- field energy gap, Δ ≈ 9.5 K, observed in the low-temperature excitation spectrum of Cs2CuBr4 [Zvyagin et al:, Phys. Rev. Lett. 112, 077206 (2014)], is present well above TN. Noticeably, the transition into the long-range magnetically ordered phase does not significantly affect the size of the gap, suggesting that even below TN the high-energy spin dynamics in Cs2CuBr4 is determined by short-range-order spin correlations. The experimental data are compared with results of model spin-wave-theory calculations for spin-1/2 triangle-lattice antiferromagnet.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [5] ;  [5] ;  [6] ;  [7] ;  [7] ;  [8]
  1. Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany)
  2. Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany); Radboud Univ., Nijmegen (Netherlands)
  3. Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany); Institute of Solid State Physics at the TU Dresden, Dresden (Germany)
  4. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
  5. Osaka Univ. (Japan). Center for Advanced High Magnetic Field Science (AHMF)
  6. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Stony Brook Univ., NY (United States). Dept. of Physics and Astronomy; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  7. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Stony Brook Univ., NY (United States). Dept. of Physics and Astronomy
  8. Institute for Nanoscience and Cryogenics (INAC), Grenoble (France)
Publication Date:
OSTI Identifier:
1240588
Report Number(s):
BNL--111748-2016-JA
Journal ID: ISSN 1367-2630; R&D Project: PM016; KC0201050
Grant/Contract Number:
SC00112704
Type:
Accepted Manuscript
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 17; Journal Issue: 11; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY