Author/Authors :
Tang، نويسنده , , Guodong and Tang، نويسنده , , Chipui and Xu، نويسنده , , Xiaonong and He، نويسنده , , Yun and Qiu، نويسنده , , Li and Lv، نويسنده , , Liya and Wang، نويسنده , , Zhihe and Du، نويسنده , , Youwei، نويسنده ,
Abstract :
The magnetothermopower have been studied in Lu-doped Ca3−xLuxCo4O9+δ. A strong magnetic field suppression of thermopower indicates large spin entropy contribution. The magnetothermopower for doped samples are overall enhanced compared with that for undoped Ca3Co4O9+δ, providing an experimental evidence for the enhancement of spin entropy. Magnetic results confirm that Co4+ concentration is reduced by Lu doping. We suggest that the reduction in Co4+ concentration results in the enhanced spin entropy.
Keywords :
A. Thermoelectric materials , D. Magnetothermopower , C. X-ray diffraction , D. Spin entropy
