Thermopower peak in phase transition region of (1-x)La$_{2/3}$Ca$_{1/3}$MnO$_{3}$/xYSZ

Details Thermopower peak in phase transition region of (1-x)La$_{2/3}$Ca$_{1/3}$MnO$_{3}$/xYSZ Thermopower peak in phase transition region of (1-x)La$_{2/3}$Ca$_{1/3}$MnO$_{3}$/xYSZ

2004-06-17

arxiv.org/abs/cond-mat/0406399v1

J. Appl. Phys. 94, 7206 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 eps figures, Latex, J. Appl. Phys 94, 7206 (2003)

Scientific paper

10.1063/1.1624480

The thermoelectric power (TEP) and the electrical resistivity of the intergranular magnetoresistance (IGMR) composite, (1-x)La$_{2/3}$Ca$_{1/3}$MnO$_{3}$/xYSZ (LCMO/YSZ) with x = 0, 0.75%, 1.25%, 4.5%, 13% 15% and 80% of the yttria-stabalized zirconia (YSZ), have been measured from 300 K down to 77 K. Pronounced TEP peak appears during the phase transition for the samples of x $>$ 0, while not observed for x = 0. We suggest that this is due to the magnetic structure variation induced by the lattice strain which is resulting from the LCMO/YSZ boundary layers. The transition width in temperature derived from $d\chi/dT$, with $\chi$ being the AC magnetic susceptibility, supports this interpretation.

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