Short-range antiferromagnetic correlations in the superconducting state of filled skutterudite alloys Pr1−xEuxPt4Ge12
Short-range antiferromagnetic correlations in the superconducting state of filled skutterudite alloys Pr1−xEuxPt4Ge12
复制标题
填充方钴矿合金 Pr1–xEuxPt4Ge12 超导状态下的短程反铁磁关联
DOI：
10.1103/physrevb.98.064506
复制
发表时间：
2018
影响因子：
3.7
通讯作者：
Almasan, C. C.
中科院分区：
文献类型：
--
作者：
Adhikari, R. B.;Kunwar, D. L.;Jeon, I.;Maple, M. B.;Dzero, M.;Almasan, C. C.
在当前探索多带电子系统中磁性和超导电性之间相互作用的研究工作的推动下，我们通过热力学测量研究了Eu替代对填充Skutterudite超导合金的影响。随着Eu浓度的增加，超导转变温度受到抑制，这与Eu局域磁矩引起的磁熵增加一致。虽然在整个掺杂范围内都存在低温热容反常，但我们发现在掺杂的合金中，超导态的热容的肖特基峰似乎是由于内部磁场的塞曼分裂所致。我们的理论模型表明，这个场是Eu离子之间短程反铁磁关联的结果。对于具有的样品，热容中的峰值标志着Eu矩的反铁磁有序的开始。
Motivated by current research efforts toward exploring the interplay between magnetism and superconductivity in multiband electronic systems, we have investigated the effects of Eu substitution through thermodynamic measurements on the superconducting filled skutterudite alloys. An increase in Eu concentration leads to a suppression of the superconducting transition temperature consistent with an increase of magnetic entropy due to Eu local moments. While the low-temperature heat capacity anomaly is present over the whole doping range, we find that in alloys with, the Schottky peaks in the heat capacity in the superconducting state appear to be due to Zeeman splitting by an internal magnetic field. Our theoretical modeling suggests that this field is a result of the short-range antiferromagnetic correlations between the europium ions. For the samples with, the peaks in the heat capacity signal the onset of antiferromagnetic ordering of the Eu moments.