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.
@article{arxiv.cond-mat/0301122,
title = {The electrical properties of Cd2Re2O7 under pressure},
author = {N. Barisic and L. Forro and D. Mandrus and R. Jin and J. He and P. Fazekas},
journal= {arXiv preprint arXiv:cond-mat/0301122},
year = {2009}
}
Comments
21 pages, 13 figures, RevTex4, submitted for publication