The Magnetism of Li doped La$_{2}$CuO$_4$: the antiferromagnetic spin-shard state

O. P. Sushkov; A. H. Castro Neto

paper

The Magnetism of Li doped La $_{2}$ CuO $_{4}$ : the antiferromagnetic spin-shard state

arXiv:cond-mat/0504234

Abstract

We study the dynamics of a single hole in Li and Sr doped La $_{2}$ CuO $_{4}$ and its extension to a finite hole concentration. We compare the physics of La $_{2 - x}$ Sr $_{x}$ CuO $_{4}$ and La $_{2}$ Cu $_{1 - x}$ Li $_{x}$ O $_{4}$ and explain why these systems are remarkably different. We demonstrate that holes in La $_{2}$ Cu $_{1 - x}$ Li $_{x}$ O $_{4}$ are always localized and that there is a critical concentration, $x_{c} \approx 0.03$ , above which the holes break the global antiferromagnetic state into an array of weakly coupled antiferromagnetic clusters (antiferromagnetic shards). We show that the spin-shard state provides a description of the magnetic and electric properties of La $_{2}$ Cu $_{1 - x}$ Li $_{x}$ O $_{4}$ . Two experiments that can test our theory are proposed.

The Magnetism of Li doped La2​CuO4​: the antiferromagnetic spin-shard state

Abstract

The Magnetism of Li doped La $_{2}$ CuO $_{4}$ : the antiferromagnetic spin-shard state