Proton NMR Study of Pyrochlore-Like Atacamite Mn2Cl(OH)3
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概要
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The proton NMR spectrum of Mn2Cl(OH)3 with zero applied field has rather sharp peaks, and a glassy property is not observed. The temperature dependence of NMR frequency shows that antiferromagnetic transition occurs at T_{\text{N1}} (=3.4 K), and that no anomaly appears at T_{\text{N2}} (=2.7 K). However, the change in frequency is considerably larger than the normal change caused by thermal fluctuation. The magnetic structure of Mn2Cl(OH)3 determined by comparison with the observed proton NMR spectrum and the numerical calculated ones of various magnetic models shows that magnetic moments do not order in an ``all-in all-out'' orientation relative to the body center like antiferromagnetic pyrochlore, and not parallel to the local crystal field. The coexistence of antiferromagnetic and spin-glass moments does not reproduce the observed NMR spectrum. Our result suggests that the magnetic structure of atacamite Mn2Cl(OH)3 is antiferromagnetic, but different from that of pyrochlore, although it is similar to the crystal structure of geometrically frustrated pyrochlores.
- 2011-02-15
著者
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Tokita Masahiko
Fukuoka Institute Of Technology
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HAGIHALA Masato
Department of Physics, Faculty of Science and Engineering, Saga University
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Zenmyo Kazuko
Fukuoka Insititute Of Technology
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Hamasaki Tatsuichi
Department Of Applied Physics Tokyo Institute Of Technology
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Kubo Hidenori
Fukuoka Insititute Of Technology
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Hagihala Masato
Department of Physics, Saga University, Saga 840-8502, Japan
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Tokita Masahiko
Fukuoka Institute of Technology, Fukuoka 811-0295, Japan
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Zheng Xu-Gang
Department of Physics, Saga University, Saga 840-8502, Japan
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Kubo Hidenori
Fukuoka Institute of Technology, Fukuoka 811-0295, Japan
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Hamasaki Tatsuichi
Department of Physics, Kyushu Sangyo University, Fukuoka 813-8503, Japan
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Zenmyo Kazuko
Fukuoka Institute of Technology, Fukuoka 811-0295, Japan
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