INVESTIGADORES
ZYSLER Roberto Daniel
artículos
Título:
High Tc Weak Ferromagnetism at Low Carrier Concentration
Autor/es:
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
Revista:
NATURE
Editorial:
Nature Publishing Group
Referencias:
Año: 1999 p. 412 - 414
ISSN:
0028-0836
Resumen:
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 decades. 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 7x10^19 electrons cm^3 - the ground state is ferromagnetically polarized with a saturation moment of 0.07 mB 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.Este trabajo fue comentado por la misma revista por David Ceperley, en páginas 386-367, "Return of the itinerant electron".
