Elementary excitations of the S=1/2 one-dimensional antiferromagnet KCuGaF6 in a magnetic field and quantum sine-Gordon model

被引：38

作者：

Umegaki, Izumi ^{[1
]}

Tanaka, Hidekazu ^{[1
]}

Ono, Toshio ^{[1
]}

Uekusa, Hidehiro ^{[2
]}

Nojiri, Hiroyuki ^{[3
]}

机构：

[1] Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1528551, Japan

[2] Tokyo Inst Technol, Dept Chem & Mat Sci, Meguro Ku, Tokyo 1528551, Japan

[3] Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 18期

关键词：

antiferromagnetic materials; copper compounds; exchange interactions (electron); gallium compounds; Heisenberg model; magnetic susceptibility; paramagnetic resonance; potassium compounds; sine-Gordon model; solitons; COPPER BENZOATE; INDUCED GAP; CU BENZOATE; HEISENBERG-CHAINS; SPIN DYNAMICS; RESONANCE; SUSCEPTIBILITY; DEPENDENCE; CROSSOVER; YB4AS3;

D O I：

10.1103/PhysRevB.79.184401

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Elementary excitations of the S=1/2 one-dimensional Heisenberg antiferromagnet KCuGaF6 with exchange constant J/k(B)=103 K were investigated by high-frequency electron spin resonance (ESR) measurements combined with a pulsed high magnetic field. When an external magnetic field H is applied in KCuGaF6, a staggered magnetic field h is induced perpendicular to H owing to the staggered g tensor and the Dzyaloshinsky-Moriya (DM) interaction with an alternating D vector. Consequently, KCuGaF6 in a magnetic field is represented by the quantum sine-Gordon (SG) model. We observed many resonance modes including a soliton resonance, breathers, interbreather transitions, and two-breather excitation. Their resonance conditions are beautifully described by the quantum SG field theory with one adjustable parameter c(s)=h/H. To investigate the relationship between the Curie term due to the DM interaction and the proportionality coefficient c(s), magnetic susceptibility measurements were also performed varying the external field direction.

引用

页数：8

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