Role of frustration in quasi 1D conductor — Charge ordering and/or CDW in (R1,R2-DCNQI)2M (M=Ag, Li, Cu) system — |
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| Authors: | H. Sawa Y. Wakabayashi R. Tazaki T. Kakiuchi K. Kanoda R. Kato |
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| Affiliation: | (1) Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba-shi, 305-0801 Ibaraki, Japan;(2) Condensed Molecular Materials Lab., RIKEN, JST-CREST, Wako-shi, 351-0198 Saitama, Japan;(3) Department of Applied Physics, Faculty of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, 113-8156 Tokyo, Japan |
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| Abstract: | Synchrotron X-ray high-resolution measurements have been performed to investigate the nature of the insulating state of a quarter-filled quasi-one-dimensional conductor (DI-DCNQI)2Ag and the π-d interacted conductor (DBr-DCNQI)2Cu. The two-fold structure in the ground state of (DI-DCNQI)2Ag system consists of not only charge ordering columns but also monotonic charge dimerized columns caused by frustration among DCNQI columns. On the other hand, Cu salt in the insulating phase realizes a commensurate structure where the Cu charge ordering is coupled with the 3c-CDW in the insulator phase. The frustration among charged columns is restrained by the charge ordering of the Cu ions. |
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| Keywords: | 61.10.Nz 71.30.+h |
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