Multicritical behaviour in magnetic fluids
The phases of a magnetic fluid in an external field are considered. As model systems we take an ideal (hard core) gas with Ising interaction and a van der Waals gas with additional Heisenberg interaction. In mean field approximation various phases and critical points are identified. For appropria...
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| Datum: | 1999 |
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| Hauptverfasser: | , , |
| Sprache: | English |
| Veröffentlicht: |
Інститут фізики конденсованих систем НАН України
1999
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| Schriftenreihe: | Condensed Matter Physics |
| Online Zugang: | http://dspace.nbuv.gov.ua/handle/123456789/120384 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Multicritical behaviour in magnetic fluids / F. Schinagl, R. Folk, H. Iro // Condensed Matter Physics. — 1999. — Т. 2, № 2(18). — С. 313-318. — Бібліогр.: 16 назв. — англ. |
Institution
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Zusammenfassung: | The phases of a magnetic fluid in an external field are considered. As
model systems we take an ideal (hard core) gas with Ising interaction and
a van der Waals gas with additional Heisenberg interaction. In mean field
approximation various phases and critical points are identified. For appropriate
values of the ratio of the magnetic to the non-magnetic interactions
there exist multicritical points like tricritical points and critical end points.
For the ideal Ising fluid we calculate the line of wing critical points analytically
and prove classical tricritical behaviour. In the van der Waals case
wing critical points and the gas-liquid critical point may coexist. The corresponding
phase diagrams in (p, t, h)-space are shown. |
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