Ghosh Krishanu, Mazumdar Chandan, Ranganathan R, Mukherjee S
Department of Physics, The University of Burdwan, Golapbag, Bardhaman - 713104, West Bengal, India.
Condensed Matter Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064, India.
Sci Rep. 2015 Oct 30;5:15801. doi: 10.1038/srep15801.
The rare coexistence of a Griffiths phase (GP) and a geometrically frustrated antiferromagnetism in the non-stoichiometric intermetallic compound GdFe0.17Sn2 (the paramagnetic Weiss temperature θp ~ -59 K) is reported in this work. The compound forms in the Cmcm space group with large structural anisotropy (b/c ~ 4). Interestingly, all the atoms in the unit cell possess the same point group symmetry (Wycoff position 4c), which is rather rare. The frustration parameter, f = |θp|/TN has been established as 3.6, with the Néel temperature TN and Griffiths temperature TG being 16.5 and 32 K, respectively. The TG has been determined from the heat capacity measurement and also from the magnetocaloric effect (MCE). It is also shown that substantial difference in GP region may exist between zero field and field cooled measurements - a fact hitherto not emphasized so far.
本文报道了在非化学计量比金属间化合物GdFe0.17Sn2（顺磁魏斯温度θp约为 -59 K）中，格里菲斯相（GP）与几何阻挫反铁磁性的罕见共存现象。该化合物形成于具有大结构各向异性（b/c约为4）的Cmcm空间群中。有趣的是，晶胞中的所有原子都具有相同的点群对称性（Wyckoff位置4c），这相当罕见。阻挫参数f = |θp|/TN已确定为3.6，奈尔温度TN和格里菲斯温度TG分别为16.5 K和32 K。TG已通过热容测量以及磁热效应（MCE）确定。还表明，零场与场冷测量之间在GP区域可能存在显著差异——这一事实迄今尚未得到充分强调。
