N Ishimatsu et al 2009 J. Phys.: Conf. Ser. 190 012070 doi:10.1088/1742-6596/190/1/012070
N Ishimatsu1, R Sasada1, H Maruyama1, T Ichikawa2, H Miyaoka2, T Kimura3, M Tsubota2, Y Kojima2, T Tsumuraya3, T Oguchi3, N Kawamura and A Machida5
Show affiliationsWe have investigated the effect of hydrogenation on La 5d and 6p electronic states in metallic LaHx (x = 0.0, 2.0, 2.3, and 2.6) by X-ray absorption near edge structure at the La L-edges. As the hydrogen content x increases from 0 to 2.6, white-line intensity at the La L2,3-edges shows a remarkable increase in the range of x>2.0. This is interpreted as the increase in La 5d hole induced by interstitial H atoms on the octahedral sites. On the other hand, the shoulder structure at the La L1-edge disappears in the process of x = 0.0rightarrow;2.0, indicating that the p-d hybridization is weakened by H atoms on the tetrahedral sites. This study demonstrates that H atoms on the two interstitial H sites provide different contribution to the modification of the electronic states.
71.20.Ps Other inorganic compounds
78.70.Dm X-ray absorption spectra
61.72.J- Point defects and defect clusters
82.30.-b Specific chemical reactions; reaction mechanisms
71.30.+h Metal-insulator transitions and other electronic transitions
Condensed matter: electrical, magnetic and optical
Issue 1 (2009)
N Ishimatsu et al 2009 J. Phys.: Conf. Ser. 190 012070
Marco Giorgetti et al 2009 J. Phys.: Conf. Ser. 190 012146
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M Wilke et al 2009 J. Phys.: Conf. Ser. 190 012090
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