磁场中S=1/2一维反铁磁体KCuGaF6的元激发和量子sine-Gordon模型
Elementary excitations of S=1/2 one-dimensional antiferromagnet KCuGaF6 in magnetic field and quantum sine-Gordon model
摘要：
用高频ESR测量结合脉冲强磁场研究了交换常数为103 K的S=1/2一维海森堡反铁磁体$_6$的元激发.当外加磁场H时，由于交错的g张量和具有交替D矢量的Dzyaloshinsky-Moriya（DM）相互作用，在$_6$中感应出垂直于H的交错的磁场h.因此，磁场中的$_6$由量子sine-Gordon（SG）模型表示。我们观察到许多共振模式，包括孤子共振，呼吸者，呼吸者转换和双呼吸者激发。它们的共振条件由具有一个可调参数$c_ s=h/H$的量子SG场论优美地描述。为了研究由DM相互作用引起的居里项与比例系数$c_s$之间的关系，还进行了改变外场方向的磁化率测量。
英文摘要：
Elementary excitations of the S=1/2 one-dimensional Heisenberg antiferromagnet KCuGaF$_6$ with exchange constant $J/k_B$=103 K were investigated by high-frequency ESR measurements combined with a pulsed high magnetic field. When an external magnetic field H is applied in KCuGaF$_6$, 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, KCuGaF$_6$ 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 proportional coefficient $c_s$, magnetic susceptibility measurements were also performed varying the external field direction.
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