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Evolution of the Magnetic and Superconducting States in UCoGe With Fe and Ni Substitution

Published online by Cambridge University Press:  01 February 2011

James Jeffrey Hamlin ,
Ryan Eagle Baumbach ,
Kevin Huang ,
Marc Janoschek ,
Noravee Kanchanavatee ,
Diego A. Zocco  and
M. Brian Maple
James Jeffrey Hamlin
Affiliation:
[email protected], University of California, San Diego, Department of Physics, La Jolla, California, United States
Ryan Eagle Baumbach
Affiliation:
[email protected]
Kevin Huang
Affiliation:
[email protected], University of California, San Diego, Department of Physics, La Jolla, California, United States
Marc Janoschek
Affiliation:
[email protected], University of California, San Diego, Department of Physics, La Jolla, California, United States
Noravee Kanchanavatee
Affiliation:
[email protected], University of California, San Diego, Department of Physics, La Jolla, California, United States
Diego A. Zocco
Affiliation:
[email protected], University of California, San Diego, Department of Physics, La Jolla, California, United States
M. Brian Maple
Affiliation:
[email protected], University of California, San Diego, Department of Physics, La Jolla, California, United States
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Abstract

The very small number of known ferromagnetic superconductors places the study of such compounds at the frontier of superconductivity research. Recently, UCoGe has emerged as a new member of the class of materials exhibiting coexistence of ferromagnetism and superconductivity (Curie temperature TCurie = 3 K; superconducting critical temperature Ts = 0.8 K). This compound has generated much excitement, in part because it has been proposed that the superconductivity derives from spin triplet pairing mediated by ferromagnetic interactions. Therefore, a key question is how changes in the magnetic state of UCoGe affect the superconducting properties. We have carried out a comprehensive study of the UCo1-xFexGe and UCo1-xNixGe series of compounds across the entire range of composition 0 ≤ x ≤ 1. We report the results of x-ray diffraction, electrical resistivity, and magnetization measurements to elucidate the magnetic and superconducting phase diagram of the U[Fe, Co, Ni]Ge system. Substitution of either Ni or Fe into UCoGe initially results in an increase in the Curie temperature. At higher dopant concentrations (x), the ferromagnetic state crosses over to paramagnetism in UCo1-xFexGe and antiferromagnetism in UCo1-xNixGe.

Keywords

superconductingferromagneticmagnetic properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1264: Symposia Z/BB – Basic Actinide Science and Materials for Nuclear Applications , 2010 , 1264-Z12-04
Copyright
Copyright © Materials Research Society 2010

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