Universität zu Köln

Valiska, Michal ORCID: 0000-0002-6332-8009, Pospisil, Jiri ORCID: 0000-0001-6642-5317, Stunault, Anne, Takeda, Yukiharu, Gillon, Beatrice, Haga, Yoshinori, Prokes, Karel ORCID: 0000-0002-7034-1738, Abd-Elmeguid, Mohsen M., Nenert, Gwilherm ORCID: 0000-0002-5168-9464, Okane, Tetsuo, Yamagami, Hiroshi, Chapon, Laurent, Gukasov, Arsene, Cousson, Alain, Yamamoto, Etsuji and Sechovsky, Vladimir ORCID: 0000-0003-1298-2120 (2015). Gradual Localization of 5f States in Orthorhombic UTX Ferromagnets: Polarized Neutron Diffraction Study of Ru Substituted UCoGe. J. Phys. Soc. Jpn., 84 (8). TOKYO: PHYSICAL SOC JAPAN. ISSN 0031-9015

Full text not available from this repository.

Abstract

We report on a microscopic study of the evolution of ferromagnetism in the Ru substituted ferromagnetic superconductor (FM SC) UCoGe crystallizing in the orthorhombic TiNiSi-type structure. For that purpose, two single crystals with composition UCo0.97Ru0.03Ge and UCo0.88Ru0.12Ge have been prepared and characterized by magnetization, AC susceptibility, specific heat and electrical resistivity measurements. Both compounds have been found to order ferromagnetically below T-C = 6.5 and 7.5 K, respectively, which is considerably higher than the T-C = 3 K of the parent compound UCoGe. The higher values of T-C are accompanied by enhanced values of the spontaneous moment mu(spont) = 0.11 mu(B)/f.u. and mu(spont) = 0.21 mu(B)/f.u., respectively in comparison to the tiny spontaneous moment of UCoGe (about 0.07 mu(B)/f.u.). No sign of superconductivity was detected in either compound. The magnetic moments of the samples were investigated on the microscopic scale using polarized neutron diffraction (PND) and for UCo0.88Ru0.12Ge also by soft X-ray magnetic circular dichroism (XMCD). The analysis of the PND results indicates that the observed enhancement of ferromagnetism is mainly due to the growth of the orbital part of the uranium 5 f moment mu(U)(L), reflecting a gradual localization of the 5 f electrons with Ru substitution. In addition, the parallel orientation of the U and Co moments has been established in both substituted compounds. The results are discussed and compared with related isostructural ferromagnetic UTX compounds (T: transition metals, X: Si, Ge) in the context of a varying degree of the 5 f-ligand hybridization.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Valiska, Michal UNSPECIFIED orcid.org/0000-0002-6332-8009 UNSPECIFIED Pospisil, Jiri UNSPECIFIED orcid.org/0000-0001-6642-5317 UNSPECIFIED Stunault, Anne UNSPECIFIED UNSPECIFIED UNSPECIFIED Takeda, Yukiharu UNSPECIFIED UNSPECIFIED UNSPECIFIED Gillon, Beatrice UNSPECIFIED UNSPECIFIED UNSPECIFIED Haga, Yoshinori UNSPECIFIED UNSPECIFIED UNSPECIFIED Prokes, Karel UNSPECIFIED orcid.org/0000-0002-7034-1738 UNSPECIFIED Abd-Elmeguid, Mohsen M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nenert, Gwilherm UNSPECIFIED orcid.org/0000-0002-5168-9464 UNSPECIFIED Okane, Tetsuo UNSPECIFIED UNSPECIFIED UNSPECIFIED Yamagami, Hiroshi UNSPECIFIED UNSPECIFIED UNSPECIFIED Chapon, Laurent UNSPECIFIED UNSPECIFIED UNSPECIFIED Gukasov, Arsene UNSPECIFIED UNSPECIFIED UNSPECIFIED Cousson, Alain UNSPECIFIED UNSPECIFIED UNSPECIFIED Yamamoto, Etsuji UNSPECIFIED UNSPECIFIED UNSPECIFIED Sechovsky, Vladimir UNSPECIFIED orcid.org/0000-0003-1298-2120 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-396423
DOI:	10.7566/JPSJ.84.084707
Journal or Publication Title:	J. Phys. Soc. Jpn.
Volume:	84
Number:	8
Date:	2015
Publisher:	PHYSICAL SOC JAPAN
Place of Publication:	TOKYO
ISSN:	0031-9015
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RAY CIRCULAR-DICHROISM; BAND MAGNETISM; URHGE; SPIN; SUPERCONDUCTIVITY; INTERMETALLICS; MAGNETIZATION; HYBRIDIZATION; ENTROPY; DENSITY Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/39642