Correlations and Semimetallic Behaviors in Pyrochlore Oxide Cd2Re2O7

Details Correlations and Semimetallic Behaviors in Pyrochlore Oxide Cd2Re2O7 Correlations and Semimetallic Behaviors in Pyrochlore Oxide Cd2Re2O7

2002-11-22

arxiv.org/abs/cond-mat/0211517v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, J. Phys. Soc. Jpn., in press

Scientific paper

10.1143/JPSJ.72.21

Electronic properties of the metallic pyrochlore oxide Cd2Re2O7 are studied by means of electrical resistivity and Hall measurements. Semimetallic band structures are revealed as expected from band structure calculations. It is found that large changes in carrier density and mass occur at the structural phase transition at Ts1 = 200 K. A large mass enhancement is observed, particularly for the high-temperature phase with the ideal pyrochlore structure, suggesting that an anomalous correlation has an important effect on the itinerant electrons in the pyrochlore lattice.

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