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タイトル: | Muon spin relaxation studies of the frustrated quasi-two-dimensional square-lattice spin system Cu(Cl,Br)La(Nb,Ta)(2)O-7: Evolution from spin-gap to antiferromagnetic state |
著者: | Uemura, Y. J. Aczel, A. A. Ajiro, Y. Carlo, J. P. Goko, T. Goldfeld, D. A. Kitada, A. Luke, G. M. MacDougall, G. J. Mihailescu, I. G. Rodriguez, J. A. Russo, P. L. Tsujimoto, Y. Wiebe, C. R. Williams, T. J. Yamamoto, T. Yoshimura, K. Kageyama, H. |
キーワード: | antiferromagnetic materials copper compounds frustration lanthanum compounds magnetic susceptibility magnetisation muon probes Neel temperature phase separation spin systems |
発行日: | Nov-2009 |
出版者: | American Physical Society |
誌名: | PHYSICAL REVIEW B |
巻: | 80 |
号: | 17 |
論文番号: | 174408 |
抄録: | We report muon spin relaxation (μSR) and magnetic-susceptibility measurements on Cu(Cl, Br)La(Nb, Ta)2O7, which demonstrate: (a) the absence of static magnetism in (CuCl)LaNb2O7 down to 15 mK confirming a spin-gapped ground state; (b) phase separation between partial volumes with a spin-gap and static magnetism in (CuCl)La(Nb, Ta)2O7; (c) history-dependent magnetization in the (Nb, Ta) and (Cl, Br) substitution systems; (d) a uniform long-range collinear antiferromagnetic state in (CuBr)LaNb2O7; and (e) a decrease in Néel temperature with decreasing Br concentration x in Cu(Cl1−xBrx)LaNb2O7 with no change in the ordered Cu moment size for 0.33≤x≤1. Together with several other μSR studies of quantum phase transitions in geometrically frustrated spin systems, the present results reveal that the evolution from a spin-gap to a magnetically ordered state is often associated with phase separation and/or a first-order phase transition. |
著作権等: | © 2009 The American Physical Society |
URI: | http://hdl.handle.net/2433/109859 |
DOI(出版社版): | 10.1103/PhysRevB.80.174408 |
関連リンク: | http://link.aps.org/doi/10.1103/PhysRevB.80.174408 |
出現コレクション: | 学術雑誌掲載論文等 |
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