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arXiv · 1704.04013

Switching of magnetic ground states across the UIr1-xRhxGe alloy system

Jiri Pospisil·Yoshinori Haga·Shinsaku Kambe·Yo Tokunaga·Naoyuki Tateiwa·Dai Aoki·Fuminori Honda·Ai Nakamura·Yoshiya Homma·Etsuji Yamamoto·Tomoo Yamamura
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Abstract

We investigated the evolution of magnetism in the UIr1-xRhxGe system 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 distance close to the Hill limit. We established the x-T phase diagram of the UIr1-xRhxGe system and found a discontinuous antiferromagnetic/ferromagnetic boundary at xcrit = 0.56 where a local minimum in ordering temperature and maximum of the Sommerfeld coefficient 175 mJ/mol K2 occurs in the UCoGe-URhGe-UIrGe system, signaling an increase in magnetic fluctuations. However, a quantum critical point is not realized because of the finite ordering temperature at xcrit. 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 the b axis in the entire UIr1-xRhxGe system including the ferromagnetic region UCo0.6Rh0.4Ge - URhGe.

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Jiri Pospisil, Yoshinori Haga, Shinsaku Kambe, Yo Tokunaga, Naoyuki Tateiwa, Dai Aoki, Fuminori Honda, Ai Nakamura, Yoshiya Homma, Etsuji Yamamoto, Tomoo Yamamura. 2017-04-13. Switching of magnetic ground states across the UIr1-xRhxGe alloy system. https://doi.org/10.1103/physrevb.95.155138

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