Abstract
The effects of Y-doping on spin entropy of Ca3Co4O9+δ have been investigated through measurements of magnetothermopower and magnetic properties. The temperature dependence of thermopower at 4 T is weaker than that at 0 T, showing a clear field-induced suppression of thermopower and a large contribution from spin entropy. The results from magnetic measurements demonstrate that Co4+ concentration decreases with increasing Y-doping level, which gives rise to enhanced spin entropy. A suitable model is adopted to explain commendably the spin entropy enhancement.
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