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Pressure-induced transition from a correlated insulator to a fermi liquid observed in geometrically frustrated Hg2Ru2O7 pyrochlore

Recently discovered pyrochlore oxide, Hg2Ru2O7, shows a first order metal-insulator transition at T∼107 K. The effect of hydrostatic pressure on the M-I transition was studied by measuring the temperature dependent resistivity ρ(T) up to 12 GPa. The application of pressure suppressed the low tempera...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2007-06, Vol.76 (6)
Main Authors: TAKESHITA, Nao, TERAKURA, Chieko, TOKURA, Yoshinori, YAMAMOTO, Ayako, TAKAGI, Hidenori
Format: Article
Language:English
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Summary:Recently discovered pyrochlore oxide, Hg2Ru2O7, shows a first order metal-insulator transition at T∼107 K. The effect of hydrostatic pressure on the M-I transition was studied by measuring the temperature dependent resistivity ρ(T) up to 12 GPa. The application of pressure suppressed the low temperature insulating state and eventually induced a transition from a correlated insulator to a metal at around 5 GPa. With decreasing temperature, ρ(T) in the metallic phase showed a rapid decrease at around T*∼40 K, likely representing the onset of a coherent-incoherent crossover, and eventually a well defined T2-dependence at low temperatures, indicative of the presence of coherent quasi-particles. All these results point the formation of a Fermi liquid with an enhanced mass in the metallic state of this geometrically frustrated system, located close proximity to the correlation driven metal-insulator transition.
ISSN:0031-9015
1347-4073
DOI:10.1143/jpsj.76.063707