NDLI: Superconductivity and the Van Hove Scenario

Content Provider	SpringerLink
Author	Bok, Julien Bouvier, Jacqueline
Copyright Year	2012
Abstract	We give a review of the role of the Van Hove singularities in superconductivity. Van Hove singularities (VHs) are a general feature of low-dimensional systems. They appear as divergences of the electronic density of states (DOS). Jacques Friedel and Jacques Labbé were the first to propose this scenario for the A15 compounds. In NbTi, for example, Nb chains give a quasi-1D electronic structure for the d-band, leading to a VHs. They developed this model and explained the high T $_{C}$ and the many structural transformations occurring in these compounds. This model was later applied by Jacques Labbé and Julien Bok to the cuprates and developed by Jacqueline Bouvier and Julien Bok. The high T $_{C}$ superconductors cuprates are quasi-bidimensional (2D) and thus lead to the existence of Van Hove singularities in the band structure. The presence of VHs near the Fermi level in the cuprates is now well established. In this context we show that many physical properties of these materials can be explained, in particular the high critical temperature T $_{C}$, the anomalous isotope effect, the superconducting gap and its anisotropy, and the marginal Fermi liquid properties, they studied these properties in the optimum and overdoped regime. These compounds present a topological transition for a critical hole doping p≈0.21 hole per CuO$_{2}$ plane.
Starting Page	657
Ending Page	667
Page Count	11
File Format	PDF
ISSN	15571939
Journal	Journal of Superconductivity and Novel Magnetism
Volume Number	25
Issue Number	3
e-ISSN	15571947
Language	English
Publisher	Springer US
Publisher Date	2012-02-10
Publisher Place	Boston
Access Restriction	Subscribed
Subject Keyword	Superconductivity High T $_{C}$ Van Hove scenario Density of states Characterization and Evaluation of Materials Condensed Matter Physics Magnetism, Magnetic Materials Strongly Correlated Systems, Superconductivity
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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