Lu-induced spin entropy enhancement in system

✍ Scribed by Guodong Tang; Chipui Tang; Xiaonong Xu; Yun He; Li Qiu; Liya Lv; Zhihe Wang; Youwei Du

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 661 KB
• Volume: 150
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/j.ssc.2010.06.018

✦ Synopsis

The magnetothermopower have been studied in Lu-doped Ca 3-x Lu x Co 4 O 9+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 Ca 3 Co 4 O 9+δ , providing an experimental evidence for the enhancement of spin entropy. Magnetic results confirm that Co 4+ concentration is reduced by Lu doping. We suggest that the reduction in Co 4+ concentration results in the enhanced spin entropy.