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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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Published in: | Journal of the Physical Society of Japan 2007-06, Vol.76 (6) |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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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. |
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ISSN: | 0031-9015 1347-4073 |
DOI: | 10.1143/jpsj.76.063707 |