Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 73, Issue 3, Pages 523-525Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.73.523
Keywords
thermoelectric power; Heikes formula; transition-metal oxide; spin and orbital degeneracy
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We have found that the thermoelectric power of the ordered perovskite CaMn3-xCuxMn4O12 is negative at high temperature (-35 muV/K at 1000 K) although this material is a hole-doped conductor ill which Cu2+ is substituted for Mn3+. This is quantitatively explained by the extended Heikes formula, where entropy flows in a direction opposite to the charge.
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