أعرض تسجيلة المادة بشكل مبسط

dc.creator Larsson Sven
dc.date 2003
dc.date.accessioned 2013-06-01T10:52:09Z
dc.date.available 2013-06-01T10:52:09Z
dc.date.issued 2013-06-01
dc.identifier http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332003000400022
dc.identifier http://www.doaj.org/doaj?func=openurl&genre=article&issn=01039733&date=2003&volume=33&issue=4&spage=744
dc.identifier.uri http://koha.mediu.edu.my:8181/jspui/handle/123456789/8330
dc.description Superconductivity often occurs in crystals with one active electron per site with charge density wave (CDW) or spin density wave (SDW) as 'mother state'. It is proposed that superconductivity is possible when the differences in equilibrium geometry and energy between the diabatic CDW and SDW states are so small that there is interaction between them via the zero point vibrations. Electron pairing in real space is directly related to oxidation states being different in two units. Three valence states in succession have to be stable (ground state or low-energy excited states) and we therefore refer to this mixed valence model as the MV-3 model. Examples are chosen from bismuthates, cuprates, and fullerides. The theory is simple and straightforward and offers solutions to other important problems as well, for example for A3C(6)0(A = K; Rb), that (1) there are no magnetic moments in crystal phase, and (2) that these systems are superconducting metals while A4C(6)0 are insulators.
dc.publisher Sociedade Brasileira de Física
dc.source Brazilian Journal of Physics
dc.title Mixed valence model for superconductivity


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أعرض تسجيلة المادة بشكل مبسط