Description and connection between the oxygen order evolution and the superconducting transition in La2CuO4+y
Instituto de Física, Universidade Federal Fluminense - Niterói, RJ 24210-340, Brazil
Accepted: 12 May 2012
A recent hallmark set of experiments by Poccia et al. in cuprate superconductors related in a direct way, for the first time, time ordering (t) of oxygen interstitials in initially disordered La2CuO4+y with the superconducting transition temperature Tc(t). We provide here a description of the time ordering forming pattern domains and show, through the local free energy, how it affects the superconducting interaction. Self-consistent calculations in this granular structure with Josephson coupling among the domains reveal that the superconducting interaction is scaled by the local free energy and capture the details of Tc(t). The accurate reproduction of these apparently disconnected phenomena establishes routes to the important physical mechanisms involved in sample production and the origin of the superconductivity of cuprates.
PACS: 74.20.Mn – Nonconventional mechanisms / 74.81.Fa – Josephson junction arrays and wire networks / 74.62.En – Effects of disorder
© EPLA, 2012