Spin dynamics of S = 1/2 Heisenberg chains with a staggered transverse field: electron spin resonance studies (Review Article)
Spin dynamics of S = 1/2 Heisenberg chains with a staggered transverse field: electron spin resonance studies (Review Article)
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具有交错横向场的 S = 1/2 海森堡链的自旋动力学：电子自旋共振研究（评论文章）
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发表时间：
2012
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通讯作者：
S. Zvyagin
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作者：
S. Zvyagin
本文综述了近年来利用高场电子自旋共振（ESR）研究具有交替g张量和Dzyaloshinskii-Moriya相互作用的S = 1/2反铁磁链材料硝酸铜嘧啶[PM - cu (NO3)2(H2O)2]n （PM =嘧啶）的磁激发的实验研究成果。由于这种变化，在一维临界状态下，该材料表现出场致间隙。激发谱是由孤子和它们的束缚态、呼吸子组成的，可以用正弦戈登模型有效地描述。随着温度的升高，孤子-呼吸状态可以被抑制，从而导致ESR参数的实质性演变。这些变化可以用最近提出的具有交错横向场的S = 1/2 AF链的新理论概念来描述。高磁场诱导磁振子形成的激发谱跃迁到自旋极化态。场致间隙的非单调行为…
This article is a review of the recent achievements in experimental studies of magnetic excitations in the copper pyrimidine dinitrate [PM–Cu(NO3)2(H2O)2]n (PM = pyrimidine), an S = 1/2 antiferromagnetic chain material with an alternating g-tensor and the Dzyaloshinskii–Moriya interaction, by means of high-field electron spin resonance (ESR). Due to this alternation, in the 1D critical regime this material exhibits a field-induced gap. The excitation spectrum is formed by solitons and their bound states, breathers, and can be effectively described using the sine-Gordon model. With increasing temperature, the soliton-breather regime can be suppressed, resulting in a substantial evolution of ESR parameters. These changes can be described using a new theoretical concept recently proposed for S = 1/2 AF chains with a staggered transverse field. High magnetic field induces a transition into the spin-polarized state with the excitation spectrum formed by magnons. Nonmonotonous behavior of the field-induced gap ...