✦ LIBER ✦

Absence of a Magnetic Phase Transition in Heisenberg, Hubbard, and Kondo-Lattice (s–f) Films

✍ Scribed by A. Gelfert; W. Nolting

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 215 KB
Volume: 217
Category: Article
ISSN: 0370-1972
DOI: 10.1002/(sici)1521-3951(200002)217:2<805::aid-pssb805>3.0.co;2-p

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✦ Synopsis

The possibility of a magnetic phase transition in Heisenberg, Hubbard, and s±f (Kondo-lattice) films is investigated. It is shown that, for any finite temperature b I and any finite number of layers d I, the magnetization within every layer must vanish. Thus, the Mermin-Wagner theorem is extended to a variety of system geometries. We also comment on the microscopic interpretation of the transition from two to three dimensions in the limit dY b 3 I.

A. Gelfert and W.