Stoner gap in the superconducting ferromagnet U Ge2

N. Aso, G. Motoyama, Y. Uwatoko, S. Ban, S. Nakamura, T. Nishioka, Y. Homma, Y. Shiokawa, K. Hirota, N. K. Sato

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21 Citations (Scopus)

Abstract

We report the temperature (T) dependence of ferromagnetic Bragg peak intensities and dc magnetization of the superconducting ferromagnet U Ge2 under pressure (P). We have found that the low- T behavior of the uniform magnetization can be explained by a conventional Stoner model. A functional analysis of the data produces the following results: The ferromagnetic state below a critical pressure can be understood as the perfectly polarized state, in which heavy quasiparticles occupy only majority spin bands. A Stoner gap Δ (P) decreases monotonically with increasing pressure and increases linearly with magnetic field. We show that the present analysis based on the Stoner model is justified by a consistency check, i.e., comparison of density of states at the Fermi energy deduced from the analysis with observed electronic specific heat coefficients. We also argue the influence of the ferromagnetism on the superconductivity.

Original languageEnglish
Article number054512
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number5
DOIs
Publication statusPublished - 2006

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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