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

Zvyagin, S. A.; Ozerov, M.; Kamenskyi, D.; Wosnitza, J.; Krzystek, J.; Yoshizawa, D.; Hagiwara, M.; Hu, Rongwei; Ryu, Hyejin; Petrovic, C.; Zhitomirsky, M. E.

doi:10.1088/1367-2630/17/11/113059

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

Journal Article · Fri Nov 27 00:00:00 EST 2015 · New Journal of Physics

DOI:https://doi.org/10.1088/1367-2630/17/11/113059· OSTI ID:1240588

Zvyagin, S. A. ^[1]; Ozerov, M. ^[2]; Kamenskyi, D. ^[2]; Wosnitza, J. ^[3]; Krzystek, J. ^[4]; Yoshizawa, D. ^[5]; Hagiwara, M. ^[5]; Hu, Rongwei ^[6]; Ryu, Hyejin ^[7]; Petrovic, C. ^[7]; Zhitomirsky, M. E. ^[8]

Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany)
Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany); Radboud Univ., Nijmegen (Netherlands)
Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany); Institute of Solid State Physics at the TU Dresden, Dresden (Germany)
Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
Osaka Univ. (Japan). Center for Advanced High Magnetic Field Science (AHMF)
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)
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
Institute for Nanoscience and Cryogenics (INAC), Grenoble (France)

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 T_N. Noticeably, the transition into the long-range magnetically ordered phase does not significantly affect the size of the gap, suggesting that even below T_N 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.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC00112704

OSTI ID:: 1240588

Report Number(s):: BNL-111748-2016-JA; R&D Project: PM016; KC0201050

Journal Information:: New Journal of Physics, Vol. 17, Issue 11; ISSN 1367-2630

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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