Transport and magnetic properties of Pr 1-x Ca x CrO 3 (x=0.0–0.5): effect of t 2g orbital degeneracy on the thermoelectric power

S. Pal, S. Hébert (), C. Yaicle, C. Martin and A. Maignan

The European Physical Journal B: Condensed Matter and Complex Systems, 2006, vol. 53, issue 1, 5-9

Abstract: We report on the resistivity (ρ), thermoelectric power (S for Seebeck) and magnetic measurements of the series Pr 1-x Ca x CrO 3 (x=0.0–0.5). These orthochromites exhibit a T independent, large and positive S, from 100 K to 700 K which follows the Cr 4+ concentration. Upon Ca 2+ for Pr 3+ substitution, a concomitant decrease of the resistivity and S values is found. The evolution of S as a function of hole concentration (Cr 4+ ) can be nicely fitted by the modified Heikes formula which takes into account the orbital degeneracy associated to Cr 3+ /Cr 4+ . This is in good agreement with the model previously calculated by Marsh and Parris, in the case of weak magnetic coupling [Phys. Rev. B 54, 7720 (1996)]. The magnetic susceptibility measurements support the assumption of a weak magnetic coupling since the antiferromagnetic ordering T N values are found to be lower than 250 K. For Pr 0.7 Ca 0.3 CrO 3 , the power factor PF= S 2 /ρ measured at 700 K is equal to 1.9×10 -4 W m -1 K -2 . The present system, chemically stable in air up to T > 1000 °C, is promising for thermoelectric application at very high temperature. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Keywords: 71.27.+a Strongly correlated electron systems; heavy fermions, 72.15.Jf Thermoelectric and thermomagnetic effects, 72.80.Ga Transition-metal compounds , (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1140/epjb/e2006-00349-8

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