Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/40857
DC FieldValueLanguage
dc.contributor.authorProvidência, João da-
dc.contributor.authorBrajczewska, Marta-
dc.contributor.authorFiolhais, Carlos-
dc.date.accessioned2017-04-17T16:13:45Z-
dc.date.available2017-04-17T16:13:45Z-
dc.date.issued1989-
dc.identifier.citationPROVIDÊNCIA, João da ; BRAJCZEWSKA, Marta ; FIOLHAIS, Carlos – Collective and intrinsic degrees of freedom in the Heisenberg ferromagnet. Journal of physics. A : Mathematical and Theoretical. Bristol : Institute of Physics. ISSN 1751-8113. Vol. 22 (1989), p. 703-715.-
dc.identifier.issn1751-8113por
dc.identifier.urihttp://hdl.handle.net/10316/40857-
dc.description.abstractA separation between collective and intrinsic degrees of freedom in the Heisenberg model of a ferromagnet at a finite temperature is achieved by reformulating the thermal boson expansion previously obtained by the present authors. In the new approach, all the collective modes (spin waves) have wavenumbers lower than a certain value. The intrinsic energy turns out to be the usual mean-field energy minus a correlation energy due to the excitations of spin waves. The influence of the cutoff in momentum space on the critical temperature is studied and the temperature dependence of the spin-wave renormalisation factor and the magnetisation are calculated.por
dc.language.isoengpor
dc.publisherInstitute of Physicspor
dc.rightsopenAccesspor
dc.subjectHeisenberg ferromagnetpor
dc.titleCollective and intrinsic degrees of freedom in the Heisenberg ferromagnet.por
dc.typearticle-
degois.publication.firstPage703por
degois.publication.lastPage715por
degois.publication.locationBristolpor
degois.publication.titleJournal of physics. A : Mathematical and Theoreticalpor
dc.peerreviewedyespor
dc.identifier.doi10.1088/0305-4470/22/6/021por
degois.publication.volume22por
item.grantfulltextopen-
item.languageiso639-1en-
item.fulltextCom Texto completo-
crisitem.author.deptFaculdade de Ciências e Tecnologia, Universidade de Coimbra-
crisitem.author.parentdeptUniversidade de Coimbra-
crisitem.author.researchunitCenter for Physics, University of Coimbra-
crisitem.author.orcid0000-0002-1527-0738-
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais
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