Crystal Structure and Spin-Singlet State of the Li

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概要

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• The crystal structure and electronic properties of the triclinic Li<inf>x</inf>VOPO<inf>4</inf>insertion electrode system with 0.9\leq x \leq 1 are explored through measurements of x-ray four-circle diffraction, magnetization, and electron paramagnetic resonance. For x = 0.95 at 295 K, the one-dimensional corner-sharing chain of distorted VO<inf>6</inf>octahedra has the alternating V--V distances of 3.5986 and 3.6219 Å with mixed-valence states of V⁴⁺and V⁵⁺. All of the compositions exhibit a one-dimensional paramagnetism at temperatures above T_{\text{c1}} \simeq 15 K due to the compensation from V--O--V bond angles in spite of the bond alternation. They have a long-range order to spin-singlet states at T_{\text{c2}} \simeq 10 K due to the alternating-exchange couplings, accompanied by spin-dimer fluctuations between T_{\text{c1}} and T_{\text{c2}}.

• 2013-05-15

著者

• Onoda Masashige

  Division of Physics, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan

• Ikeda Satoshi

  Division of Physics, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan

関連論文

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