Hydrostatic pressure-induced modifications of structural transitions lead to large enhancements of magnetocaloric effects in MnNiSi-based systems
Hydrostatic pressure-induced modifications of structural transitions lead to large enhancements of magnetocaloric effects in MnNiSi-based systems
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DOI：
10.1103/physrevb.91.020401
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发表时间：
2015-01-05
影响因子：
3.7
通讯作者：
Stadler, Shane
中科院分区：
文献类型：
--
作者：
Samanta, Tapas;Lepkowski, Daniel L.;Stadler, Shane
通过与 MnFeGe 化学合金化，MnNiSi 的结构转变温度从 1200 K 显着降低至 < 300 K，导致磁转变和结构转变的耦合，从而在室温附近产生大的磁热效应。应用相对较低的静水压力（类似于 2.4 kbar）会导致等温熵变显着增强，在环境压力和 2.4 kbar 施加压力下，等温熵变分别从 -Delta S = 44 增加到 89 J/kgK，场变化为 Delta B = 5 T，并且与 P = 2.4 kbar 时约 7% 的较大相对体积变化相关。
A remarkable decrease of the structural transition temperature of MnNiSi from 1200 to < 300 K by chemically alloying it with MnFeGe results in a coupling of the magnetic and structural transitions, leading to a large magnetocaloric effect near room temperature. Application of relatively low hydrostatic pressures (similar to 2.4 kbar) lead to an extraordinary enhancement of the isothermal entropy change from -Delta S = 44 to 89 J/kgK at ambient and 2.4 kbar applied pressures, respectively, for a field change of Delta B = 5 T, and is associated with a large relative volume change of about 7% with P = 2.4 kbar.