Theory of superconductivity in layered metals

Jha, Sudhanshu Shekhar (1993) Theory of superconductivity in layered metals Proceedings of the Indian National Science Academy - Part A: Physical Sciences, 59 (4). pp. 331-346. ISSN 0370-0046

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Abstract

The problem of superconductivity in metal at low temperatures has been of great theoretical interest for a very long time. The first real microscopic understanding of this impotant process became possible only in 1957, with the development of the well-known BCS pairing theory involving a net dynamical attractive interaction between electrons near the metallic Fermi surface, induced by the phonon-exchange mechanism. It is known for sometime now that the net attractive interaction can also arise from the exchange of suitable electronic excitations in the system. However, with the recent discovery of high-temperature superconductivity in layered cuprates and other oxides, in which the electronic motion in their normal metallic state is highly correlated, many questions have been raised regarding the validity of the generalized pairing theory of superconductivity in such materials. Alternative possibilities for superconductivity in highly correlated cuprates based mostly on the two-dimensional one-band repulsive Hubbard model have been investigated extensively in recent years. In this presentation, it will be argued that superconductivity in highly correlated layered metals can still be understood within a suitably generalized framework of the pairing theory developed by us recently. Explicit results for the transition temperature Tc and the anisotropy of the superconductivity order parameter JJ1 will be presented. These are calculated for a general phenomenological model in which both intra-layer and inter-layer couplings of electrons at various conducting layers in each unit cell are included, without specifying the exact exchange mechanism. The effect of an external magnetic field on Tc and the calculation of the temperature-dependence of the uppe critical field Hc2 will also be discussed briefly.

Item Type:Article
Source:Copyright of this article belongs to Indian National Science Academy.
Keywords:High-Tc Superconductivity; Layered Metals; Pairing Theory; Anisotropic Order Parameters
ID Code:97542
Deposited On:03 Mar 2013 06:49
Last Modified:03 Mar 2013 06:49

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