Universität zu Köln

Valiska, Michal ORCID: 0000-0002-6332-8009, Pospisil, Jiri ORCID: 0000-0001-6642-5317, Divis, Martin ORCID: 0000-0001-9425-0171, Prokleska, Jan ORCID: 0000-0003-3246-5112, Sechovsky, Vladimir ORCID: 0000-0003-1298-2120 and Abd-Elmeguid, Mohsen M. (2015). Evolution of ferromagnetic and non-Fermi-liquid states with doping: The case of Ru-doped UCoGe. Phys. Rev. B, 92 (4). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

We have investigated the impact of Ru substitution for Co on the behavior of the ferromagnetic superconductor UCoGe by performing x-ray diffraction, magnetization, specific heat, and electrical resistivity measurements on polycrystalline samples of the UCo1-xRuxGe series (0 >= x <= 0.9). The initial Ru substitution up to x approximate to 0.1 leads to a simultaneous sharp increase of the Curie temperature and spontaneous magnetization up to maximum values of T-C = 8.6 K and MS = 0.1 mu(B) per formula unit, respectively, whereas superconductivity vanishes already for x approximate to 0.03. Further increase of the Ru content beyond x approximate to 0.1 leads to a precipitous decrease of both TC and MS towards a ferromagnetic quantum critical point (QCP) at x(cr) = 0.31. Consequently, the T - x magnetic phase diagram consists of a well-developed ferromagnetic dome. We discuss the evolution of ferromagnetism with x on the basis of band structure changes due to varying 5f-ligand hybridization. This scenario is supported by the results of electronic structure calculations and consideration of the simplified periodic Anderson model. The analysis of the temperature dependencies of the electrical resistivity and heat capacity at low temperatures of the samples in the vicinity of the QCP reveals a non-Fermi-liquid behavior and assigns the ferromagnetic quantum phase transition to be most likely of a continuous Hertz-Millis type.

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 Divis, Martin UNSPECIFIED orcid.org/0000-0001-9425-0171 UNSPECIFIED Prokleska, Jan UNSPECIFIED orcid.org/0000-0003-3246-5112 UNSPECIFIED Sechovsky, Vladimir UNSPECIFIED orcid.org/0000-0003-1298-2120 UNSPECIFIED Abd-Elmeguid, Mohsen M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-398844
DOI:	10.1103/PhysRevB.92.045114
Journal or Publication Title:	Phys. Rev. B
Volume:	92
Number:	4
Date:	2015
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MAGNETIC-PROPERTIES; ELECTRONIC-STRUCTURE; TERNARY; HYBRIDIZATION; BEHAVIOR; SUPERCONDUCTIVITY; TRANSITION; TRANSPORT; DISORDER; POINTS Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/39884