The nature of the first order isostructural transition in GdRhSn
The nature of the first order isostructural transition in GdRhSn
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DOI：
10.1016/j.jallcom.2014.06.027
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发表时间：
2014-11
影响因子：
6.2
通讯作者：
Sachin Gupta;K. Suresh;A. Nigam;Y. Mudryk;D. Paudyal;V. Pecharsky;K. Gschneidner
中科院分区：
文献类型：
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作者：
Sachin Gupta;K. Suresh;A. Nigam;Y. Mudryk;D. Paudyal;V. Pecharsky;K. Gschneidner
我们展示了多晶 GdRhSn 的结构、磁、热、磁热和电输运特性。磁化数据显示，它在 TN= 16.2 K 时反铁磁性有序。该化合物在室温下具有 ZrNiAl 型六方晶体结构，并在 245 K 的顺磁态下经历一级同结构转变。转变时晶胞体积变化很小 (-0.07%) 但不连续，与磁、输运和热容测量观察到的转变的一级性质一致。冷却时晶格参数的各向异性变化为 Δa/a= 0.28% 和 Δc/c= -0.64%。当高温相转变为低温相时，4f 和传导电子杂化发生显着变化，导致积分 DOS 增加。使用磁化强度和热容数据测量了 TN 处的中等磁热效应（ΔSM=−6.5 J/kg K 和 ΔTad=4.5 K，ΔH=50 kOe）。
We present structural, magnetic, thermal, magnetocaloric, and electrical transport properties of polycrystalline GdRhSn. Magnetization data show that it orders antiferromagnetically atTN= 16.2 K. The compound has the ZrNiAl type hexagonal crystal structure at room temperature and undergoes a first order iso-structural transition in the paramagnetic state at 245 K. The unit cell volume change at the transition is small (−0.07%) but discontinuous, in agreement with the first-order nature of the transition observed by magnetic, transport, and heat capacity measurements. The anisotropic changes of the lattice parameters are Δa/a= 0.28% and Δc/c= −0.64% on cooling. A substantial change in the 4f and conduction electron hybridization, giving rise to an increased integrated DOS, occurs when the high temperature phase transforms to the low temperature phase. A moderate magnetocaloric effect atTN(ΔSM= −6.5 J/kg K and ΔTad= 4.5 K for ΔH= 50 kOe) has been measured using both magnetization and heat capacity data.