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Flat-band ferromagnetism proposed for an organic polymer crystal | | Ryotaro Arita
; Yuji Suwa
; Kazuhiko Kuroki
; Hideo Aoki
; | | Date: |
8 Aug 2003 | | Subject: | Strongly Correlated Electrons; Materials Science | cond-mat.str-el cond-mat.mtrl-sci | | Abstract: | Motivated from the flat-band ferromagnetism conceived theoretically for a single chain of five membered rings (polyaminotriazole) by Arita {it et al.}, [Phys. Rev. Lett. {f 88}, 127202 (2002)], we have studied whether the magnetism can indeed occur as a bulk, i.e., in a three-dimensional crystal of the polymer, by means of the spin density functional calculation. We find that the intra-chain ferromagnetism is robust against crystallization as far as the flat band is made half-filled. We have further investigated the actual crystal doped with various compounds, where HF$_2$ is shown to put the system close to the bulk ferromagnetism while stronger anions such as BF$_4$ or PF$_6$ should be promising. | | Source: | arXiv, cond-mat/0308156 | | Services: | Forum | Review | PDF | Favorites | |
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