The violation of the Wiedemann-Franz law in the spin polaron formulation

Abstract

In this paper, a treatment of the Wiedemann-Franz (WF) law is given, on the basis of the hole/spin-wave (spin polaron) model of the t−J (one-band Hubbard) model, which is considered one of the best descriptions of the copper-oxide planes in these materials. Based on this formulation of the theory, we prove conclusively that the WF law will indeed break down for the layered oxide materials mainly due to hole/spin-wave coupling. As an example, we study the data for Sr₁₄Cu₂₄O₄₁.