The electrical properties of Cd2Re2O7 under pressure

Details The electrical properties of Cd2Re2O7 under pressure The electrical properties of Cd2Re2O7 under pressure

2003-01-09

arxiv.org/abs/cond-mat/0301122v1

Physical Review B 67, 245112 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

21 pages, 13 figures, RevTex4, submitted for publication

Scientific paper

10.1103/PhysRevB.67.245112

We examine the resistivity and thermopower of single crystal specimens of the pyrochlore oxide Cd2Re2O7 at pressures up to 2GPa. Thermopower proves to be a sensitive tool in the study of the phase diagram of Cd2Re2O7. The 200K metal-to-metal phase transition is accompanied by a strong increase of the absolute value of the thermopower. A weaker anomaly allows to identify a second phase transition at 125K. Following the temperature dependence of this anomaly, we obtain the corresponding phase boundary up to 1.2GPa, and argue that it must drop to T=0 before p reaches 1.8GPa. There is a wide temperature range where the electrical properties are fairly sensitive to pressure, indicating the strong coupling of the electronic degrees of freedom to the lattice.

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