Charge-orbital ordering and Verwey transition in magnetite measured by resonant soft X-ray scattering |
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Authors: | Huang D J Lin H-J Okamoto J Chao K S Jeng H-T Guo G Y Hsu C-H Huang C-M Ling D C Wu W B Yang C S Chen C T |
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Affiliation: | National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan. djhuang@nsrrc.org.tw |
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Abstract: | We report experimental evidence for the charge-orbital ordering in magnetite below the Verwey transition temperature T(V). Measurements of O K-edge resonant x-ray scattering on magnetite reveal that the O 2p states in the vicinity of the Fermi level exhibit a charge-orbital ordering along the c axis with a spatial periodicity of the doubled lattice parameter of the undistorted cubic phase. Such a charge-orbital ordering vanishes abruptly above T(V) and exhibits a thermal hysteresis, correlating closely with the Verwey transition in magnetite. |
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