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ヤマガミ ヒロシ
YAMAGAMI HIROSHI
山上 浩志 所属 京都産業大学 理学部 物理科学科 職種 教授 |
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| 発行・発表の年月 | 2014/12/23 |
| 形態種別 | その他 |
| 査読 | 査読あり |
| 標題 | Polarized neutron diffraction and X-ray magnetic circular dichroism study of Ru doped UCoGe |
| 執筆形態 | その他 |
| 著者・共著者 | Michal Valiska,Jiri Pospisil,Anne Stunault,Yukiharu Takeda,Beatrice Gillon,Yoshinori Haga,Karel Prokes,Gwilherm Nenert,Tetsuo Okane,Hiroshi Yamagami,Laurent Chapon,Arsene Goukassov,Allain Cousson,Etsuji Yamamoto,Vladimir Sechovsky |
| 概要 | We report on microscopic study of the ferromagnetism enhancement in the Ru<br />
doped ferromagnetic superconductor (FM SC) UCoGe. For that purpose, two single<br /> crystals with composition UCo0.97Ru0.03Ge and UCo0.88Ru0.12Ge were prepared.<br /> Both single crystals were investigated by polarized neutron diffraction (PND)<br /> at low temperatures in magnetic fields and the latter one also by the soft<br /> X-ray magnetic circular dichroism (XMCD) method. UCo0.96Ru0.03Ge and<br /> UCo0.88Ru0.12Ge have been found ordering ferromagnetically below the Curie<br /> temperature TC = 6 K and 8.5 K, respectively, which are considerable higher<br /> than TC = 3 K of UCoGe. The increase of TC is accompanied by enhancement of the<br /> spontaneous moment to ms = 0.11 mB/f.u. and ms = 0.21 mB/f.u., respectively.<br /> The analysis of the PND results assigns the ferromagnetism enhancement mainly<br /> to the growth of the orbital part of uranium 5 f moment. In contrast to the<br /> published results of PND study of the parent UCoGe, we have found parallel<br /> orientation of the U and Co moments in both doped compounds. Evolution of<br /> magnetic characteristics with Ru concentration is discussed within a scenario<br /> considering the varying 5 f-ligand hybridization as the key mechanism. |
| arXiv ID | arXiv:1412.7087 |
| PermalinkURL | http://arxiv.org/abs/1412.7087v2 |