Relationship between pressure-induced charge transfer and the superconducting transition temperature in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} superconductors
- Centre d`Etudes de Saclay, Departement d`Etudes du Comportement des Materiaux, Section de Recherches de Metallurgie Physique, 91191 Gif-sur-Yvette Cedex (France)
- Institut des Sciences des Materiaux, Universite de Paris-Sud, Batiment 415, 91405 Orsay (France)
A model is proposed for the pressure dependence of {ital T}{sub {ital c}} based on the inverted parabolic relationship between {ital T}{sub {ital c}} and the hole carrier density {ital n} that takes into account the fact that {ital T}{sub {ital c}} drops to zero for a minimum value {ital n}{sup min} or a maximum value {ital n}{sup max} of {ital n}. The models proposed previously by Almasan {ital et} {ital al}. and Neumeier and Zimmermann are recovered, and are shown to be quite similar. Detailed calculations for YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} superconductors show that one can obtain large enhancements in {ital T}{sub {ital c}} under pressure in materials that are highly underdoped, or have relatively modest rates of pressure-induced charge transfers. On the other hand, {ital T}{sub {ital c}} enhancements in compounds which are near optimum doping or which have large rates of pressure-induced charge transfers are found to be quite modest.
- OSTI ID:
- 44542
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 51, Issue 17; Other Information: PBD: 1 May 1995
- Country of Publication:
- United States
- Language:
- English
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