Where is 99% of the condensation energy of Tl_2Ba_2CuO_y coming from?

TL;DR

This paper explains the source of 99% of the condensation energy in Tl_2Ba_2CuO_y, attributing it to in-plane kinetic energy changes, beyond Anderson's interlayer tunneling model.

Contribution

It introduces a new explanation for the majority of the condensation energy, emphasizing in-plane kinetic energy gain during superconductivity in Tl_2Ba_2CuO_y.

Findings

Anderson's model accounts for 1% of the energy

Predicted in-plane kinetic energy gain of 1-3 meV per planar oxygen

Effect may be detectable in underdoped dirty samples

Abstract

Anderson's interlayer tunneling model can account for up to 1% of the condensation energy of Tl_2Ba_2CuO_y. Here we account for the remaining 99%. We predict an in-plane kinetic energy gain of 1 to 3 meV per planar oxygen in the optimally doped material when it goes superconducting. It is suggested that the effect may be most easily detected in underdoped dirty samples.