Europhys. Lett.
Volume 65, Number 2, January 2004
Page(s) 249 - 255
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 January 2004
Europhys. Lett., 65 (2) , pp. 249-255 (2004)
DOI: 10.1209/epl/i2003-10075-5

On the energy saved by interlayer interactions in the superconducting state of cuprates

M. V. Ramallo

Department of Physics, University of Illinois - Urbana, IL 61801-3080, USA

(Received 25 August 2003; accepted 13 November 2003)

A Ginzburg-Landau-like functional is proposed reproducing the main low-energy features of various possible high- $T_{\ab{c}}$ superconducting mechanisms involving energy savings due to interlayer interactions. The functional may be used to relate these savings to experimental quantities. Two examples are given, involving the mean-field specific-heat jump at $T_{\ab{c}}$ and the superconducting fluctuations above $T_{\ab{c}}$. Comparison with existing data suggests, e.g., that the increase of $T_{\ab{c}}$ due to the so-called interlayer tunneling (ILT) mechanism of interlayer kinetic-energy savings is negligible in optimally doped $\chem{Bi_2Sr_2CaCu_2O}$ 8+x.

74.20.-z - Theories and models of superconducting state.
74.20.De - Phenomenological theories (two-fluid, Ginzburg-Landau, etc.).

© EDP Sciences 2004