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

被引：12

作者：

Zvyagin, S. A. ^{[1
]}

Ozerov, M. ^{[1
]}

Kamenskyi, D. ^{[1
]}

Wosnitza, J. ^{[1
,2
]}

Krzystek, J. ^{[3
]}

Yoshizawa, D. ^{[4
]}

Hagiwara, M. ^{[4
]}

Hu, Rongwei ^{[5
,6
]}

Ryu, Hyejin ^{[5
,6
]}

Petrovic, C. ^{[5
,6
]}

Zhitomirsky, M. E. ^{[7
]}

机构：

[1] Helmholtz Zentrum Dresden Rossendorf, Dresden High Magnet Field Lab HLD EMFL, D-01328 Dresden, Germany

[2] Tech Univ Dresden, Inst Festkorperphys, D-01062 Dresden, Germany

[3] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

[4] Osaka Univ, Grad Sch Sci, Ctr Adv High Magnet Field Sci AHMF, Toyonaka, Osaka 5600043, Japan

[5] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA

[6] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

[7] UJF, CEA, INAC, UMR E9001,Serv Phys Stat Magnetisme & Supraconduc, F-38054 Grenoble 9, France

来源：

NEW JOURNAL OF PHYSICS | 2015年 / 17卷

关键词：

magnetism; frustration; spectroscopy; HIGH-FIELD ESR; RESONANCE; PHASE; ORDER;

D O I：

10.1088/1367-2630/17/11/113059

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report 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, Delta approximate to 9.5 K, observed in the low-temperature excitation spectrum of Cs2CuBr4, (Zvyagin et al. 2014 Phys. Rev. Lett. 112 077206) 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 triangular-lattice antiferromagnet.

引用

页数：7

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