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arXiv 1303.4285cond-mat.str-el
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分子量子自旋链中电荷序对磁对称性的破坏

Charge Order Breaks Magnetic Symmetry in Molecular Quantum Spin Chains

M. Dressel, M. Dumm, T. Knoblauch, B. Köhler, B. Salameh, S. Yasin

摘要:

电荷序影响大部分的电子性质,但被认为不会改变自旋排列,因为磁化率保持不变。我们对准一维(TMTTF)2X盐(X= PF 6、AsF 6和SbF 6)进行了电子自旋共振实验,结果表明,当电子铁电性出现时,磁性在低于TCO时发生改变。阴离子和有机分子的耦合将g张量旋转出分子平面,在域壁的相邻链上产生磁性非等效位点。由于各向异性的塞曼相互作用,在电荷有序态下观察到一种新的磁相互作用机制,即Δ H的旋转周期加倍。

英文摘要:

Charge order affects most of the electronic properties but is believed not to alter the spin arrangement since the magnetic susceptibility remains unchanged. We present electron-spin-resonance experiments on quasi-one-dimensional (TMTTF)2X salts (X= PF6, AsF6 and SbF6), which reveal that the magnetic properties are modified below TCO when electronic ferroelectricity sets in. The coupling of anions and organic molecules rotates the g-tensor out of the molecular plane creating magnetically non-equivalent sites on neighboring chains at domain walls. Due to anisotropic Zeeman interaction a novel magnetic interaction mechanism in the charge-ordered state is observed as a doubling of the rotational periodicity of Delta H.

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