Guangcun's Blog分享 http://blog.sciencenet.cn/u/gcshan 哥伦比亚大学访问学者,香港城市大学校董 (2011-2012)

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Abnormal TE, MCE and electronic structure of GdCo compound

已有 1476 次阅读 2015-10-4 11:29 |个人分类:科学札记|系统分类:论文交流| compound

Abnormal thermal expansion, multiple transitions, magnetocaloric effect, and electronic structure of GdCo 
ABSTRACT


The structure of known GdCo compound is re-determined as GdCo, adopting the GdCoSi structure type, which is characterized by two disorder Co sites filling the Gd octahedral and a short Gd-Gd distance within the octahedra. The compound shows uniaxial negative thermal expansion in paramagnetic state, significant negative expansion in ferromagnetic state, and positive expansion below ca. 140 K. It also exhibits large magnetocaloric effect, with an entropy change of −6.4 J kg−1 K−1 at 50 kOe. In the lattice of thecompound, Co atoms at different sites show different spin states. It was confirmed by the X-ray photoelectron spectra and calculation of electronic structure and shed lights on the abnormalthermal expansion. The stability of such compound and the origin of its magnetism are also discussed based on measured and calculated electronic structures.




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