某些化学计量和非化学计量Tb基三元锗化物的场致磁转变电阻增强
Enhanced electrical resistance at the field-induced magnetic transitions in some stoichiometric and nonstoichiometric Tb-based ternary germanides
摘要：
我们提出了一些Tb化合物的磁性和输运行为，即，TbIrGe 2、TbFe（0.4）Ge 2和TbCo（0.4）Ge 2。化学计量比的锗化物TbIrGe 2在10 K附近的一个很近的温度区间内表现出至少两个明显的磁性转变。非化学计量比的化合物TbFe（0.4）Ge 2和TbCo（0.4）Ge 2分别在17和19 K附近发生磁有序。这些化合物的磁状态似乎是反铁磁类。同时，这些化合物的磁化强度（M）、磁电阻（MR）的场响应与熵变曲线之间存在相关性。也就是说，这些Tb化合物表现出“正”MR和超过磁场的熵变，其中M还显示出场诱导的转变。基于这种相关性，我们得出结论，在这些化合物中诱导了超过临界场的磁无序/波动--“一种称为逆变磁性的现象”--而不是变磁性。
英文摘要：
We present the magnetic and transport behavior of some Tb compounds, viz., TbIrGe2, TbFe(0.4)Ge2, and TbCo(0.4)Ge2. The stoichoometric germanide TbIrGe2 exhibits at least two distinct magnetic transitions in a close temperature interval around 10 K. The non-stoichiometric compounds, TbFe(0.4)Ge2 and TbCo(0.4)Ge2, undergo magnetic ordering around 17 and 19 K respectively. The magnetic state of these compouds appears to be antiferromagnetic-like. Qualitatively, there is a correlation between the field response of the magnetization (M), the magnetoresistance (MR) and the entropy change curve in all these compouds. That is, these Tb compounds exhibit a "positive" MR and entropy change beyond a magnetic field where M also shows a field-induced transition. On the basis of this correlaion, we conclude that magnetic disorder/fluctuations beyond a critical field - "a phenomenon called inverse metamagnetism" - rather than metamagnetism,is induced in these compounds.
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。
