Two-Fermi liquid model for high Tc superconductivity involving suppression of tunnelling by decoherence

Kumar, N (1993) Two-Fermi liquid model for high Tc superconductivity involving suppression of tunnelling by decoherence. In: Current Science (Bangalore), 64 (10). pp. 754-755.

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Abstract

We consider a model system of two interacting Fermi-liquids, one of which is light and the other much heavier. In the normal state the lighter component provides a quantum mechanical bath coupled 'ohmically' to the heavier component in the sense of Caldeira and Leggett, suppressing thereby the band (tunnelling) matrix elements of the heavier component. Thus we lose the energy of delocalization. On the other hand, a superconducting ordering stiffens the bath spectral function at low energies and so restores the tunnelling. The resulting regain of the delocalization energy bootstraps so as to stabilize the superconducting order that caused it. It is conceivable that the motions parallel to the easy ab-plane and along the hard c-axis may also effectively correspond to the light and the heavy Fermi-liquids, respectively.

Item Type:	Editorials/Short Communications
Publication:	Current Science (Bangalore)
Publisher:	Indian Academy of Sciences
Additional Information:	Copyright of this article belongs to Indian Academy of Sciences.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	31 Jan 2011 07:15
Last Modified:	31 Jan 2011 07:15
URI:	http://eprints.iisc.ac.in/id/eprint/35261

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