Polarized neutron diffraction and X-ray magnetic circular dichroism study of Ru doped UCoGe
Abstract
We report on microscopic study of the ferromagnetism enhancement in the Ru doped ferromagnetic superconductor (FM SC) UCoGe. For that purpose, two single crystals with composition UCo0.97Ru0.03Ge and UCo0.88Ru0.12Ge were prepared. Both single crystals were investigated by polarized neutron diffraction (PND) at low temperatures in magnetic fields and the latter one also by the soft X-ray magnetic circular dichroism (XMCD) method. UCo0.96Ru0.03Ge and UCo0.88Ru0.12Ge have been found ordering ferromagnetically below the Curie temperature TC = 6 K and 8.5 K, respectively, which are considerable higher than TC = 3 K of UCoGe. The increase of TC is accompanied by enhancement of the spontaneous moment to ms = 0.11 mB/f.u. and ms = 0.21 mB/f.u., respectively. The analysis of the PND results assigns the ferromagnetism enhancement mainly to the growth of the orbital part of uranium 5 f moment. In contrast to the published results of PND study of the parent UCoGe, we have found parallel orientation of the U and Co moments in both doped compounds. Evolution of magnetic characteristics with Ru concentration is discussed within a scenario considering the varying 5 f-ligand hybridization as the key mechanism.
Keywords
Cite
@article{arxiv.1412.7087,
title = {Polarized neutron diffraction and X-ray magnetic circular dichroism study of Ru doped UCoGe},
author = {Michal Valiska and Jiri Pospisil and Anne Stunault and Yukiharu Takeda and Beatrice Gillon and Yoshinori Haga and Karel Prokes and Gwilherm Nenert and Tetsuo Okane and Hiroshi Yamagami and Laurent Chapon and Arsene Goukassov and Allain Cousson and Etsuji Yamamoto and Vladimir Sechovsky},
journal= {arXiv preprint arXiv:1412.7087},
year = {2015}
}
Comments
Updated version of the manuscript with title "Gradual localization of 5f states in orthorhombic UTX ferromagnets - polarized neutron diffraction study of Ru substituted UCoGe" was submitted, see article arXiv:1504.05645