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arXiv 0708.3887cond-mat.mtrl-sci
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调节RTiGe(R = Tb,Er)化合物中的竞争磁相互作用和剪裁磁热效应

Tuning the Competing magnetic interactions in RTiGe (R = Tb, Er) Compounds and tailoring the Magnetocaloric effect

R. Nirmala, S. K. Malik

摘要:

四元层状化合物TbTiGe和ErTiGe分别在276 K和39 K具有反铁磁性。在这两种化合物中用Mo部分取代Ti改变了磁相互作用,产生铁磁基态,这导致增强的磁热效应。在磁场变化为5 T时,ErTi0.85Mo0.15Ge的磁熵变为~10.5 J/kg/K,而在磁转变附近,ErTiGe的磁熵变为~0.8 J/kg/K。因此,这种层状材料的磁热性质可以通过合适的化学取代来调节。

英文摘要:

The tetragonal layered compounds TbTiGe and ErTiGe order antiferromagnetically at 276 K and 39 K, respectively. Partial substitution of Mo for Ti in these two compounds modifies the magnetic interactions giving rise to a ferromagnetic ground state which results in an enhanced magnetocaloric effect. The magnetic entropy change in ErTi0.85Mo0.15Ge for a magnetic field change of 5 T is ~10.5 J/kg/K against ~0.8 J/kg/K for ErTiGe in the vicinity of the magnetic transition. Thus, magnetocaloric properties of such layered materials may be tunable by suitable chemical substitutions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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