Spin entropy enhancement tuned by spin state transition in La0.7-xYxCa0.3CoO3

Spin entropy enhancement tuned by spin state transition in La0.7-xYxCa0.3CoO3
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La0.7-xYxCa0.3CoO3 中自旋态转变调节的自旋熵增强

DOI:
10.1016/j.ceramint.2013.10.117
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发表时间:
2014-05
影响因子:
5.2
通讯作者:
Du, Youwei
Du, Youwei
中科院分区:
材料科学1区
文献类型:
--
作者:
Tang, Guodong;Wu, Qisheng;Qiu, Li;Du, Youwei

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研究了La0.7−xYxCa0.3CoO3(x=0.0,0.05,0.1和0.15)中自旋态对自旋熵的影响。磁热电势结果表明,Y掺杂提高了La0.7Ca0.3CoO3的自旋熵。磁性结果表明,Co ~(3+)离子经历了从中自旋态(t52 ge 1g;S=1)到低自旋态(t62 ge 0 g;S=0)的跃迁,导致自旋熵的增强.提出了一个合适的理论模型,较好地解释了自旋态跃迁引起的自旋熵的增强。这一研究提供了强有力的证据表明,增强的自旋熵的贡献,热电势是调谐的自旋状态转变。
The effect of spin states on the spin entropy has been studied in La0.7−xYxCa0.3CoO3(x=0.0, 0.05, 0.1 and 0.15). Magnetothermopower results reveal that Y-doping improves the spin entropy of La0.7Ca0.3CoO3. The magnetic results indicate that the Co3+ions undergo a transition from an intermediate spin state (t52ge1g;S=1) to a low spin state (t62ge0g;S=0), which results in the enhancement of the spin entropy. A suitable theoretical model is suggested to explain well the enhancement of the spin entropy induced by spin state transition. This investigation gives strong evidence that the enhanced spin entropy contribution to the thermopower is tuned by the spin state transition.
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影响因子: 3.7
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