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We report a detailed investigation of the thermopower and magnetic properties of La0.95 Ba0.05CoO3. The large negative magnetothermopower is found to scale with both magnetic field and temperature, indicating a spin-entropy contribution to the thermpower. We formulate a new general expression to describe the thermopower from spin entropy with spin-interaction considered. The scaling behaviour is analyzed...
The effect of spin states on the spin entropy has been studied in La 0.7−x Y x Ca 0.3 CoO 3 (x=0.0, 0.05, 0.1 and 0.15). Magnetothermopower results reveal that Y-doping improves the spin entropy of La 0.7 Ca 0.3 CoO 3 . The magnetic results indicate that the Co 3+ ions undergo a transition from an intermediate spin state (t 5 ...
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