Optical response of PrRu4P12 due to metal insulator transition

Citation
T. Nanba et al., Optical response of PrRu4P12 due to metal insulator transition, PHYSICA B, 261, 1999, pp. 853-854
Citations number
3
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA B
ISSN journal
0921-4526 → ACNP
Volume
261
Year of publication
1999
Pages
853 - 854
Database
ISI
SICI code
0921-4526(199901)261:<853:OROPDT>2.0.ZU;2-Y
Abstract
PrRu4P12 and CeRu4P12 are ternary metal phosphides with the skutterudite st ructure. CeRu4P12 is a semiconductor, but PrRu4P12 was found to show a meta l-insulator transition at around 60 K (T-c) from the electrical resistivity . The temperature dependence of the optical reflection spectra of both samp les were measured in the energy region of 5 meV-4 eV. Obtained optical cond uctivity spectrum (sigma(omega)) of CeRu4P12 showed a clear gap energy of a bout 1000 cm(-1). On the other hand, for PrRu4P12 the spectrum above T-c sh owed a metallic character. From the abrupt decrease in the intensity a-spec trum below T-c, the gap energy was estimated to be about 100 cm(-1) which i s consistent with the value obtained from the electric resistivity measurem ent. Hybridization between the f and d states close to the Fermi level and the valence fluctuation of Pr ion are both discussed as the possible mechan isms for the gap formation. (C) 1999 Elsevier Science B.V. All rights reser ved.