Commensurate dynamic magnetic correlations in La2(Cu,Li)O4

TL;DR

This paper reports that unlike other doped cuprates where magnetic correlations become incommensurate, La2Cu_{1-z}Li_{z}O4 uniquely maintains commensurate magnetic correlations despite doping.

Contribution

It presents the first evidence that La2Cu_{1-z}Li_{z}O4 retains commensurate magnetic correlations, challenging the established understanding of doping effects in cuprates.

Findings

Magnetic correlations in La2Cu_{1-z}Li_{z}O4 remain commensurate upon doping.

Contrasts with incommensurate correlations observed in other doped cuprates.

Provides new insights into magnetic behavior in cuprate materials.

Abstract

When sufficient numbers of holes are introduced into the two-dimensional CuO2 square lattice, dynamic magnetic correlations become incommensurate with underlying lattice in all previously investigated La_{2-x}A_xCu_{1-z}B_zO_{4+y} (A=Sr or Nd, B=Zn) including high T_C superconductors and insulators, and in bilayered superconducting YBa_2Cu_3O_{6.6} and Bi_2Sr_2CaCu_2O_8. Magnetic correlations also become incommensurate in structurally related La_2NiO_4 when doped with Sr or O. We report an exception to this so-far well established experimental "rule" in La_2Cu_{1-z}Li_{z}O_4 in which magnetic correlations remain commensurate.