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

共 44 条

[21]

Marchenko V. I., 1976, SOV PHYS JETP, V43, P794

[22] THE CRYSTAL STRUCTURE OF CESIUM TETRABROMOCUPRATE(II) [J].

MOROSIN, B ;

LINGAFELTER, EC .

ACTA CRYSTALLOGRAPHICA, 1960, 13 (10) :807-809

[23] Dynamical structure factor of the triangular-lattice antiferromagnet [J].

Mourigal, M. ;

Fuhrman, W. T. ;

Chernyshev, A. L. ;

Zhitomirsky, M. E. .

PHYSICAL REVIEW B, 2013, 88 (09)

[24] Magnetization plateaux of the S=1/2 two-dimensional frustrated antiferromagnet Cs2CuBr4 [J].

Ono, T ;

Tanaka, H ;

Kolomiyets, O ;

Mitamura, H ;

Goto, T ;

Nakajima, K ;

Oosawa, A ;

Koike, Y ;

Kakurai, K ;

Klenke, J ;

Smeibidle, P ;

Meissner, M .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2004, 16 (11) :S773-S778

[25]

Ono T, 2005, PROG THEOR PHYS SUPP, P217, DOI 10.1143/PTPS.159.217

[26] Magnetization plateau in the frustrated quantum spin system Cs2CuBr4 -: art. no. 104431 [J].

Ono, T ;

Tanaka, H ;

Katori, HA ;

Ishikawa, F ;

Mitamura, H ;

Goto, T .

PHYSICAL REVIEW B, 2003, 67 (10) :7

[27] Modes of Magnetic Resonance in the Spin-Liquid Phase of Cs2CuCl4 [J].

Povarov, K. Yu. ;

Smirnov, A. I. ;

Starykh, O. A. ;

Petrov, S. V. ;

Shapiro, A. Ya. .

PHYSICAL REVIEW LETTERS, 2011, 107 (03)

[28] Bose-Einstein condensation of magnons in Cs2CuCl4 -: art. no. 127202 [J].

Radu, T ;

Wilhelm, H ;

Yushankhai, V ;

Kovrizhin, D ;

Coldea, R ;

Tylczynski, Z ;

Lühmann, T ;

Steglich, F .

PHYSICAL REVIEW LETTERS, 2005, 95 (12)

[29] Functional renormalization group for the anisotropic triangular antiferromagnet [J].

Reuther, Johannes ;

Thomale, Ronny .

PHYSICAL REVIEW B, 2011, 83 (02)

[30] An electron spin resonance selection rule for spin-gapped systems [J].

Sakai, T ;

Cépas, O ;

Ziman, T .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2000, 69 (11) :3521-3524

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