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

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 and R. Zysler
Additional contact information
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
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

Nature, 1999, vol. 397, issue 6718, 412-414

Abstract: 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.

Date: 1999
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DOI: 10.1038/17081

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