Switching of magnetic ground states across the UIr1－x Rhx Ge alloy system
Switching of magnetic ground states across the UIr1－x Rhx Ge alloy system
复制标题
UIr1－x Rhx Ge合金体系磁性基态的切换
DOI：
10.1103/physrevb.95.155138
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发表时间：
2017
影响因子：
3.7
通讯作者：
Tomoo Yamamura
中科院分区：
文献类型：
--
作者：
Jiri Pospisil;Yoshinori Haga;Shinsaku Kambe;Yo Tokunaga;Naoyuki Tateiwa;Dai Aoki;Fuminori Honda;Ai Nakamura;Yoshiya Homma;Etsuji Yamamoto;Tomoo Yamamura
我们通过对高质量单晶的系统研究，研究了系统中磁性的演化。这两种母体化合物的晶格参数非常相似，导致最接近希尔极限的最接近的原子间铀距离几乎相同。我们建立了该系统的相图，发现在UCoGe-URhGe-UIrGe系统中存在一个不连续的反铁磁/铁磁边界，其中有序温度的局部极小值和索末菲系数的极大值，标志着磁涨落的增加。然而，由于有限的有序化温度，量子临界点并未实现。反铁磁侧的磁振子间隙突然抑制了磁起伏。在包括铁磁区在内的整个系统中，我们发现在临界磁场附近，包括铁磁区在内的整个系统中都存在场诱导的一级相变。
We investigated the evolution of magnetism in thesystem by the systematic study of high-quality single crystals. Lattice parameters of both parent compounds are very similar, resulting in almost identical nearest interatomic uranium distances close to the Hill limit. We established thephase diagram of thesystem and found a discontinuous antiferromagnetic/ferromagnetic boundary at, where a local minimum in ordering temperature and maximum of the Sommerfeld coefficientoccurs in the UCoGe-URhGe-UIrGe system, signaling an increase in magnetic fluctuation. However, a quantum critical point is not realized because of the finite ordering temperature at. A magnon gap on the antiferromagnetic side abruptly suppresses magnetic fluctuations. We find a field-induced first order transition in the vicinity of the critical magnetic field along theaxis () in the entiresystem, including the ferromagnetic region.