caa a22 4500 46789289X CHVBK 20180406152754.0 cr unu---uuuuu 170328e20061001xx s 000 0 eng 10.1007/s10955-006-9120-0 doi (NATIONALLICENCE)springer-10.1007/s10955-006-9120-0 Magnetism and the Weiss Exchange Field-A Theoretical Analysis Motivated by Recent Experiments [Elektronische Daten] [C. Albert, L. Ferrari, J. Fröhlich, B. Schlein] The huge spin precession frequency observed in recent experiments with spin-polarized beams of hot electrons shot through magnetized films is interpreted as being caused by Zeeman coupling of the electron spins to the so-called Weiss exchange field in the film. The microscopic origin of exchange interactions and of large mean exchange fields, leading to different types of magnetic order, is elucidated. A microscopic derivation of the equations of motion of the Weiss exchange field is presented. Novel proofs of the existence of phase transitions in quantum XY-models and antiferromagnets, based on an analysis of the statistical distribution of the exchange field, are presented. Springer Science+Business Media, Inc., 2006 Albert C. Theoretical Physics, ETH-Hönggerberg, CH-8093, Zürich, China aut Ferrari L. Theoretical Physics, ETH-Hönggerberg, CH-8093, Zürich, China aut Fröhlich J. Theoretical Physics, ETH-Hönggerberg, CH-8093, Zürich, China aut Schlein B. Theoretical Physics, ETH-Hönggerberg, CH-8093, Zürich, China aut Journal of Statistical Physics Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 125/1(2006-10-01), 77-124 0022-4715 125:1<77 2006 125 10955 https://doi.org/10.1007/s10955-006-9120-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10955-006-9120-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Albert C. Theoretical Physics, ETH-Hönggerberg, CH-8093, Zürich, China aut NATIONALLICENCE 700 1- Ferrari L. Theoretical Physics, ETH-Hönggerberg, CH-8093, Zürich, China aut NATIONALLICENCE 700 1- Fröhlich J. Theoretical Physics, ETH-Hönggerberg, CH-8093, Zürich, China aut NATIONALLICENCE 700 1- Schlein B. Theoretical Physics, ETH-Hönggerberg, CH-8093, Zürich, China aut NATIONALLICENCE 773 0- Journal of Statistical Physics Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 125/1(2006-10-01), 77-124 0022-4715 125:1<77 2006 125 10955 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer