標題: Structural distortion and electronic states of Rb doped WO3 by X-ray absorption spectroscopy
作者: Wang, Y. C.
Hsu, C. H.
Hsu, Y. Y.
Chang, C. C.
Dong, C. L.
Chan, T. S.
Kumar, Krishna
Liu, H. L.
Chen, C. L.
Wu, M. K.
加速器光源科技與應用學位學程
Master and Ph.D. Program for Science and Technology of Accelrrator Light Source
公開日期: 2016
摘要: Rubidium tungsten bronzes (RbxWO3) have recently attracted much attention due to their intriguing phenomena, such as complex structural phase transitions, strong electron-phonon coupling, and superconducting properties. This study investigates the local atomic and electronic structures of RbxWO3 (0.17 <= x <= 0.33). X-ray powder diffraction patterns showed a hexagonal tungsten bronze (HTB) phase. X-ray absorption spectra (XAS) at the W L-3-edge and Rb K-edge of RbxWO3 were carried out. The XAS analysis indicated a local distorted WO6 octahedron which leads to a splitting of e(g) and t(2g) energy states in the tungsten 5d orbital and this splitting of energy levels exhibited an asymmetrical behavior at x = 0.23 and 0.27. Overall analysis revealed a distortion of local atomic structure of the WO6 octahedra by rubidium doping, leading to the modification of the electronic structures of e(g) and t(2g) states in the tungsten 5d orbital, thereby accounting for the property changes in CDW formation and superconducting transition temperature of these materials.
URI: http://dx.doi.org/10.1039/c6ra21777j
http://hdl.handle.net/11536/132909
ISSN: 2046-2069
DOI: 10.1039/c6ra21777j
期刊: RSC ADVANCES
Volume: 6
Issue: 109
起始頁: 107871
結束頁: 107877
顯示於類別:期刊論文