Quantum paraelectric model for layered superconductors

Shenoy, S. R. ; Subrahmanyam, V. ; Bishop, A. R. (1997) Quantum paraelectric model for layered superconductors Physical Review Letters, 79 (23). pp. 4657-4660. ISSN 0031-9007

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Official URL: http://prl.aps.org/abstract/PRL/v79/i23/p4657_1

Related URL: http://dx.doi.org/10.1103/PhysRevLett.79.4657


We consider a Hubbard-model (H) layer of charged-carrier fraction x≪1, and an rms buckling angle s≪1, that is elastically and electrically coupled to anharmonic (oxygen) dipoles in a ferroelectric Bilz-model (B) layer. We find that (a) the B-layer dipoles are driven to a paraelectric phase by H-layer zero-point fluctuations; (b) the c-axis (dipolar, optical) and H-layer (acoustic) modes are mixed by s to form ω±(q) modes; and (c) the mode exchange, enhanced by a (ω+2-ω-2)-1~s-1 resonant denominator, produces dynamical local carrier pairing and 2D Anderson-Morel dx2-y2-type superconductivity, with peaks or plateaus in Tc(x).

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:92816
Deposited On:04 Jun 2012 13:54
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