We report measurements of magnetothermopower and magnetoresistivity as a function of temperature on Ru Sr2 Gd2-x Cex Cu2 O10+δ (x=0.6,1). In a magnetic field of 5 T, the size of thermopower decreases significantly, whereas the normal-state resistivity decreases slightly, which behaves similarly to Ru Sr2 Gd1-x Lax Cu2 O8 (x=0,0.1). A significant decrease of thermopower for both samples could be attributed to the decrease of the spin entropy contribution associated with the carriers in the Ru O2 layers, as the Ru moments are aligned with the magnetic field. It is also found that the nonmetallic temperature dependence at low T follows a variable range hopping process for both samples.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)