S = 1/2反铁磁链状化合物δ-（EDT-TTF -CONMe_2）_2 X（X=AsF_6，Br）自旋动力学的多频电子自旋共振研究
Spin dynamics in S = 1/2 antiferromagnetic chain compounds delta-(EDT-TTF-CONMe_2)_2X (X=AsF_6, Br): a multi-frequency Electron Spin Resonance study
摘要：
用多频电子自旋共振（ESR）研究了准一维非二聚四分之一填充莫特绝缘体delta-（EDT-TTF-CONMe_2）_2X（X=AsF_6，Br）在4 ~ 420 GHz范围内的电子自旋共振（ESR）谱。在T~190 K以上的高温正交相，高温自旋磁化率的大小和温度依赖性可用S = 1/2的海森堡反铁磁链来描述，其中J_AsF_6 =298 K，J_Br=474 K，耦合常数分别为X=AsF_6和Br.我们从线宽的温度依赖性估计交换各向异性，J '/J ~2 * 10^{-3}。的线宽和g-移位的频率依赖性有一个不寻常的二次依赖在所有的晶体取向，我们归因于反对称交换（Dzyaloshinskiii-Moriya）相互作用。
英文摘要：
We present a multi-frequency Electron Spin Resonance (ESR) study in the range of 4 GHz to 420 GHz of the quasi-one-dimensional, non-dimerized, quarter-filled Mott insulators, delta-(EDT-TTF-CONMe_2)_2X (X=AsF_6, Br). In the high temperature orthorhombic phase above T~190 K, the magnitude and the temperature dependence of the high temperature spin susceptibility are described by a S = 1/2 Heisenberg antiferromagnetic chain with J_AsF6=298 K and J_Br=474 K coupling constants for X=AsF_6 and Br respectively. We estimate from the temperature dependence of the line width an exchange anisotropy, J'/J of ~2 * 10^{-3}. The frequency dependence of the line width and the g-shift have an unusual quadratic dependence in all crystallographic orientations that we attribute to an antisymmetric exchange (Dzyaloshinskii--Moriya) interaction.
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