XANES study of charge ordering on the spin-Peierls phase transition of alpha'-NAV2O5

T Shobu; Y Noda; E Ninomiya; H Sawa; S Nagamatsu; T Fujikawa; Y Ueda; M Isobe; N Ikeda; T Uruga

doi:10.1107/s0909049500020872

XANES study of charge ordering on the spin-Peierls phase transition of alpha'-NAV2O5

J Synchrotron Radiat. 2001 Mar 1;8(Pt 2):746-8. doi: 10.1107/s0909049500020872.

Authors

T Shobu¹, Y Noda, E Ninomiya, H Sawa, S Nagamatsu, T Fujikawa, Y Ueda, M Isobe, N Ikeda, T Uruga

Affiliation

¹ Graduate School of Science and Technology, Chiba University, Yayoi, Inage, Japan. syobu@rism.tohoku.ac.jp

PMID: 11512917
DOI: 10.1107/s0909049500020872

Abstract

alpha'-NaV2O5 transforms at Tc = 34K, and the origin of the phase transition seems to be caused by the charge order and spin-Peierls mechanism. However the experiments which reveal the existence of charge order are very little. We measured XANES of V atoms which relates to the valence of V. It was found that the valences of V atoms in NaV2O5 were V4.5+ in the high temperature phase by comparing pre-edge and XANES of NaV2O5 with that of LiV2O5 CaV2O5 and V2O5. The analysis of EXAFS also shows the environment of the V4.5+ state.