Naslov
Electrical properties of Cd2Re2O7 under pressure

Autori
Barišić, Neven ; Forro, Laszlo ; Mandruš, D. ; Jin, R. ; He, J. ; Fazekas, P.

Izvornik
Physical Review B - Condensed Matter and Materials Physics (1098-0121) 67 (2003), 24; 245112-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
electrical properties ; resistivity ; thermopower ; high pressure effects ; phase diagram ; metal-to-metal phase transition ; temperature dependence ; strong coupling ; 1.2 to 2 GPa ; 200 K ; 125 K ; Cd2Re2O7.

Sažetak
We examine the resistivity and thermopower of single crystal specimens of the pyrochlore oxide Cd2Re2O7 at pressures up to 2 GPa. Thermopower proves to be a sensitive tool in the study of the phase diagram of Cd2Re2O 7. The 200 K metal-to-metal phase transition is accompanied by a strong increase of the absolute value of the thermopower. A weaker anomaly allows us to identify a second phase transition at 125 K. Following the temperature dependence of this anomaly, we obtain the corresponding phase boundary up to 1.2 GPa, and argue that it must drop to T=0 before p reaches 1.8 GPa. 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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