Optical probe of the metal-insulator transition in pyrochlore-type molybdate

Y. Taguchi; K. Ohgushi; Y. Tokura

Optical probe of the metal-insulator transition in pyrochlore-type molybdate

Y. Taguchi, K. Ohgushi, Y. Tokura

Research output: Contribution to journal › Article › peer-review

Abstract

We have investigated a metal-insulator transition in a 4d-electron system R₂Mo₂O₇ (R = Sm and Y) by means of optical spectroscopy. The electronic structure is reconstructed over an energy range of several electron volt upon the transition. The insulating Y₂Mo₂O₇ compound shows an optical gap of ca. 0.1 eV at 10 K and the temperature dependence of optical conductivity is rather weak. On the other hand, metallic Sm₂Mo₂O₇ exhibits a tiny Drude-peak and strong mid-infrared absorption at 10 K and the conductivity strongly depends on temperature. These observations demonstrate the importance of correlation effect also in 4d-electron system with a wider bandwidth than 3d-electron system.

Original language	English
Article number	115102
Pages (from-to)	1151021-1151025
Number of pages	5
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	65
Issue number	11
Publication status	Published - 2002 Mar 15
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Cite this

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title = "Optical probe of the metal-insulator transition in pyrochlore-type molybdate",

abstract = "We have investigated a metal-insulator transition in a 4d-electron system R2Mo2O7 (R = Sm and Y) by means of optical spectroscopy. The electronic structure is reconstructed over an energy range of several electron volt upon the transition. The insulating Y2Mo2O7 compound shows an optical gap of ca. 0.1 eV at 10 K and the temperature dependence of optical conductivity is rather weak. On the other hand, metallic Sm2Mo2O7 exhibits a tiny Drude-peak and strong mid-infrared absorption at 10 K and the conductivity strongly depends on temperature. These observations demonstrate the importance of correlation effect also in 4d-electron system with a wider bandwidth than 3d-electron system.",

author = "Y. Taguchi and K. Ohgushi and Y. Tokura",

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T1 - Optical probe of the metal-insulator transition in pyrochlore-type molybdate

AU - Taguchi, Y.

AU - Ohgushi, K.

AU - Tokura, Y.

PY - 2002/3/15

Y1 - 2002/3/15

N2 - We have investigated a metal-insulator transition in a 4d-electron system R2Mo2O7 (R = Sm and Y) by means of optical spectroscopy. The electronic structure is reconstructed over an energy range of several electron volt upon the transition. The insulating Y2Mo2O7 compound shows an optical gap of ca. 0.1 eV at 10 K and the temperature dependence of optical conductivity is rather weak. On the other hand, metallic Sm2Mo2O7 exhibits a tiny Drude-peak and strong mid-infrared absorption at 10 K and the conductivity strongly depends on temperature. These observations demonstrate the importance of correlation effect also in 4d-electron system with a wider bandwidth than 3d-electron system.

AB - We have investigated a metal-insulator transition in a 4d-electron system R2Mo2O7 (R = Sm and Y) by means of optical spectroscopy. The electronic structure is reconstructed over an energy range of several electron volt upon the transition. The insulating Y2Mo2O7 compound shows an optical gap of ca. 0.1 eV at 10 K and the temperature dependence of optical conductivity is rather weak. On the other hand, metallic Sm2Mo2O7 exhibits a tiny Drude-peak and strong mid-infrared absorption at 10 K and the conductivity strongly depends on temperature. These observations demonstrate the importance of correlation effect also in 4d-electron system with a wider bandwidth than 3d-electron system.

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JF - Physical Review B - Condensed Matter and Materials Physics

IS - 11

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ER -

Optical probe of the metal-insulator transition in pyrochlore-type molybdate

Abstract

ASJC Scopus subject areas

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