| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1462175 | Ceramics International | 2013 | 4 Pages |
Abstract
We report the effects of rare earth Gd doping on the spin entropy in Ca3Co4O9+δ. Magnetothermopower is found to be strongly magnetic-field dependent and increases upon Gd doping, revealing that Gd doping can improve the spin entropy of Ca3Co4O9+δ. X-ray photoemission spectroscopy (XPS) results allow us to determine the decrease in Co4+ concentration induced by Gd doping. Our results confirm that the spin-entropy enhancement originates from the decrease of Co4+ concentration. The present study suggests that we can improve the spin entropy by suppressing Co4+ concentration in layered cobalt oxides.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Guodong Tang, Feng Xu, Dewei Zhang, Zhihe Wang,