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High-temperature weak ferromagnetism in a low-density free-electron gas

Author

Listed:
  • D. P. Young

    (NHMFL, Florida State University)

  • D. Hall

    (NHMFL, Florida State University)

  • M. E. Torelli

    (NHMFL, Florida State University)

  • Z. Fisk

    (NHMFL, Florida State University
    Los Alamos National Laboratory)

  • J. L. Sarrao

    (Los Alamos National Laboratory)

  • J. D. Thompson

    (Los Alamos National Laboratory)

  • H.-R. Ott

    (Laboratorium fr Festkperphysik, ETH-Hnggerberg)

  • S. B. Oseroff

    (San Diego State University)

  • R. G. Goodrich

    (Louisiana State University)

  • R. Zysler

    (Centro Atomico Bariloche)

Abstract

The magnetic properties of the ground state of a low-density free-electron gas in three dimensions have been the subject of theoretical speculation and controversy for seven decades1. Not only is this a difficult theoretical problem to solve, it is also a problem which has not hitherto been directly addressed experimentally. Here we report measurements on electron-doped calcium hexaboride (CaB6) which, we argue, show that—at a density of 7× 1019 electrons cm−3—the ground state is ferromagnetically polarized with a saturation moment of 0.07 µB per electron. Surprisingly, the magnetic ordering temperature of this itinerant ferromagnet is 600 K, of the order of the Fermi temperature of the electron gas.

Suggested Citation

  • D. P. Young & D. Hall & M. E. Torelli & Z. Fisk & J. L. Sarrao & J. D. Thompson & H.-R. Ott & S. B. Oseroff & R. G. Goodrich & R. Zysler, 1999. "High-temperature weak ferromagnetism in a low-density free-electron gas," Nature, Nature, vol. 397(6718), pages 412-414, February.
    • Handle: RePEc:nat:nature:v:397:y:1999:i:6718:d:10.1038_17081
    DOI: 10.1038/17081
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