Evolution of the magnetic and superconducting states in UCoGe with Fe and Ni substitution

ORAL

Abstract

Recently, UCoGe has emerged as a new member of the class of materials exhibiting coexistence of ferromagnetism and superconductivity (Curie temperature T$_{Curie} = 3$ K; superconducting critical temperature T$_c = 0.8$ K). This compound has generated much excitement in part because it has been proposed that the superconductivity derives from spin triplet pairing mediated by critical fluctuations of the magnetic order parameter. Thus, 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 UCo$_{1-x}$Fe$_x$Ge and UCo$_{1-x}$Ni$_x$Ge series of compounds across the entire range of composition $0 \leq x \leq 1$. In this talk, 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.

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Authors

  • J. J. Hamlin

    University of California, San Diego

  • N. Kanchanavatee

    University of California, San Diego

  • K. Huang

    University of California, San Diego

  • R. E. Baumbach

    Department of Physics, University of California at San Diego, La Jolla, CA, USA, University of California, San Diego

  • D. A. Zocco

    University of California, San Diego

  • L. Shu

    University of California, San Diego

  • M. Janoschek

    Department of Physics, University of California, San Diego, University of California, San Diego

  • M. B. Maple

    Department of Physics, University of California at San Diego, La Jolla, CA, USA, Department of Physics, University of California, San Diego, La Jolla, California 92093, USA, UC San Diego, University of California, San Diego