We report the thermoelectric power (S) of the recently discovered superconducting pyrochlore Cd2Re2O7 with Tc = 1.4 K. In the normal state, this compound shows a continuous structural phase transition at T* = 200 K. S is negative from room temperature down to 1.4 K. Above T*, S shows small absolute values and approximatively linear dependence on temperature. S(295 K) = -2.2 μV K-1. The absolute value of S increases rapidly below T*. A kink and a minimum were observed round 125 and 60 K, respectively. S(60 K) = -8.2 μV K-1. In the low-temperature range 1.4 K < T < 20 K, another linear portion was observed. As regards the T2-dependent electrical resistivity in this temperature range, a Fermi liquid ground state is suggested for this compound. No change of S in a magnetic field up to 2 T was observed at 77 and 295 K.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics