1997 年 66 巻 2 号 p. 326-329
In this letter we report lattice dimerization and spin-gap formation of NaV2O5 below its spin-Peierls transition temperature Tsp=35.3, K, in which there are V4+ (S=1/2) linear chains along the b axis of its orthorhombic structure. A single-crystal X-ray scattering experiment shows superlattice reflections with a lattice modulation vector q=(1/2, , 1/2, , 1/4). Inelastic neutron scattering from a powder sample at T=7, K clearly demonstrates a gap energy of 9.8, meV at a scattering vector |Q|=1.0, Å-1 corresponding to the reciprocal lattice point (1, , 1/2, , 0).
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