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Coexistence of charge order and antiferromagnetism in (TMTTF)(2)SbF6: NMR study

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Title: Coexistence of charge order and antiferromagnetism in (TMTTF)(2)SbF6: NMR study
Authors: Nomura, K. Browse this author →KAKEN DB
Yamamoto, M. Browse this author
Matsunaga, N. Browse this author
Hirose, S. Browse this author
Shimohara, N. Browse this author
Satoh, T. Browse this author
Isome, T. Browse this author
Liu, Y. Browse this author
Kawamoto, A. Browse this author
Keywords: Charge order
Quasi-one-dimensional conductor
Issue Date: 1-Mar-2015
Publisher: Elsevier
Journal Title: Physica B: Condensed Matter
Volume: 460
Start Page: 53
End Page: 57
Publisher DOI: 10.1016/j.physb.2014.11.039
Abstract: The electronic state of (TMTTF)(2)SbF6 was investigated by the H-1 and C-13 NMR measurements. The temperature dependence of T-1(-1) in H-1 NMR shows a sharp peak associated with the antiferromagnetic transition at T-AF = 6 K. The temperature dependence of T-1(-1) is described by the power law T-2.4 below T-A. This suggests the nodal gapless spin wave excitation in antiferromagnetic phase. In 13C NMR, two sharp peaks at high temperature region, associated with the inner and the outer carbon sites in TMTTF dimer, split into four peaks below 150 K. It indicates that the charge disproportionation occurs. The degree of charge disproportionation Delta rho is estimated as (025 +/- 0.09)e from the chemical shift difference. This value Delta rho is consistent with that obtained from the infrared spectroscopy. In the antiferromagnetic state (AFI), the observed line shape is well fitted by eight Lorentzian peaks. This suggests that the charge order with the same degree still remains in the AF state. From the line assignment, the AF staggered spin amplitude is obtained as 0.70 mu(B) and 0.24 mu(B) at the charge rich and the poor sites, respectively. These values corresponding to almost 1 mu(B) per (timer are quite different from 0.11 mu(B) of another AF (AFII) state in (TMITF)(2)Br with effective higher pressure. As a result, it is understood that the antiferromagnetic staggered spin order is stabilized on the CO state in the AFI phase of (TMTTF)2(S)bF(6).
Rights: (C) 2015 Elsevier B.V. All rights reserved
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 野村 一成

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