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Ordering and phase transitions in models of high temperature superconductors
KTH, Superseded Departments, Physics.ORCID iD: 0000-0002-9881-7857
1997 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 1997. , viii, 24 p.
Series
Trita-FYS, ISSN 0280-316X ; 8022
Keyword [en]
superconductivity, vortices, phase transitions, strongly correlated fermions, high temperature superconductivity
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-722ISRN: KTH/FYS/TEO/R--97/5--SEOAI: oai:DiVA.org:kth-722DiVA: diva2:14701
Presentation
(English)
Note
QC 20100518Available from: 2000-09-26 Created: 2000-09-26 Last updated: 2010-05-18Bibliographically approved
List of papers
1. Monte Carlo simulation of a two-dimensional continuum Coulomb gas
Open this publication in new window or tab >>Monte Carlo simulation of a two-dimensional continuum Coulomb gas
1997 (English)In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 55, 522-530 p.Article in journal (Refereed) Published
Abstract [en]

We study the classical two-dimensional (2D) Coulomb-gas model for thermal vortex fluctuations in thin superconducting/superfluid films by Monte Carlo simulation of a grand-canonical vortex ensemble defined on a continuum. The Kosterlitz-Thouless transition is well understood at low vortex density, but at high vortex density the nature of the phase diagram and of the vortex phase transition is less clear. From our Monte Carlo data we construct phase diagrams for the 2D Coulomb gas without any restrictions on the vortex density. For negative vortex chemical potential (positive vortex core energy) we always find a Kosterlitz-Thouless transition. Only if the Coulomb interaction is supplemented with a short-distance repulsion is a first-order transition Line found, above some positive value of the vortex chemical potential.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-12905 (URN)A1997WD78800078 ()
Note
QC 20100518Available from: 2010-05-18 Created: 2010-05-18 Last updated: 2017-12-12Bibliographically approved
2. Mean field analysis of a model for superconductivity in an anti-ferromagnetic background
Open this publication in new window or tab >>Mean field analysis of a model for superconductivity in an anti-ferromagnetic background
1998 (English)In: Physica. C, Superconductivity, ISSN 0921-4534, E-ISSN 1873-2143, Vol. 296, 119-136 p.Article in journal (Refereed) Published
Abstract [en]

We study a lattice fermion model for superconductivity in the presence of an anti-ferromagnetic background, described as a fixed external staggered magnetic field. We discuss the possibility that our model provides an effective description of coexistence of anti-ferromagnetic correlations and superconductivity. and its possible application to high-temperature superconductivity. We also argue that, under certain conditions, this model describes a variant of the periodic Anderson model for heavy fermions. Using a path integral formulation we construct mean field equations, which we study in some detail. We evaluate the superconducting critical temperature and show thar it is strongly enhanced by anti-ferromagnetic order. We also evaluate the superconducting gap, the superconducting density of states, and the tunneling conductivity, and show that the most stable channel usually has a d(x2-y2)-wave gap.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-12904 (URN)
Note
QC 20100518Available from: 2010-05-18 Created: 2010-05-18 Last updated: 2017-12-12Bibliographically approved

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Lidmar, Jack

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  • apa
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