Neutron Diffraction Study on the Antiferromagnetic Insulating Ground State of β-Na_<0.33>V_2O_5(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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The magnetic structure of the antiferromagnetically ordered state of a quasi-one-dimensional conductor β-Na_<0.33>V_2O_5 below T_N=24K was examined by neutron diffraction. The presence of magnetic Bragg reflections at (h, k±1/6, 0), h+k=odd below T_N indicates that the amplitudes of the magnetic moments at the V sites in three types of V-O chains are modulated with a period of 3b along the chain direction (‖b). On the other hand, it was confirmed that the lattice modulation along the b direction occurs at ∿244K and at ∿131K with a period of 2b and 6b, respectively. Although the latter structural transition had been attributed to a "charge ordering" transition, which would result in a charge disproportionation in the V 3d orbitals with a period of 6b, the 3b periodicity in the amplitude of magnetic moments strongly suggests that the charge disproportionation occurs with a period of 3b, not 6b. The 6b lattice modulation developing below 131K is therefore attributed to an instability in the V 3d band to form 3b charge modulation on the preexistent 2b lattice modulation.
- 2005-04-15
著者
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Nishi Masakazu
Institute For Solid State Phrsics University Of Tokyo
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GRENIER Beatrice
DRFMC
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YAMAUCHI Touru
SPSMS
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YAMAURA Junichi
MDN, CEA-Grenoble
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Yamaura Junichi
Institute For Solid State Physics University Of Tokyo
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Oohara Yasuaki
Institude For Solid State Physics University Of Tokyo
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Hirota Kazuma
Institute For Solid State Physics The University Of Tokyo
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Kakurai Kazuhisa
Institute For Solid State Physics University Of Tokyo
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Isobe Masahiko
Institute For Materials Research Tohoku University
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Yoshizawa Hideki
Institute For Solid State Physics The University Of Tokyo
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Nagai Satoshi
Institute For Solid State Physics The University Of Tokyo
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Ueda Yutaka
Institute For Solid State Physic The University Of Tokyo
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Yamauchi Touru
Institute For Solid State Physics The University Of Tokyo
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NODA Yukio
Institute of Multidisciplinary Research for Advanced Materials
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Kimura Hiroyuki
Institute for Protein Research, Osaka University
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