Competing frustration and dilution effects on the antiferrromagnetism in La(2-x)Sr(x)Cu(1-z)Zn(z)O(4)

TL;DR

This paper investigates how hole doping and magnetic dilution influence antiferromagnetism in La(2-x)Sr(x)Cu(1-z)Zn(z)O(4), revealing that vacancies reduce frustration and enhance magnetic order, aligning with experimental data.

Contribution

It introduces a model combining frustration and dilution effects to explain antiferromagnetic behavior in doped cuprates, matching experimental results without adjustable parameters.

Findings

Vacancies reduce frustrating bonds, increasing magnetic order.

Neel temperature dependence on doping matches renormalization group calculations.

Experimental data is accurately reproduced by the model.

Abstract

The combined effects of hole doping and magnetic dilution on a lamellar Heisenberg antiferromagnet are studied in the framework of the frustration model. Magnetic vacancies are argued to remove some of the frustrating bonds generated by the holes, thus explaining the increase in the temperature and concentration ranges exhibiting three dimensional long range order. The dependence of the Neel temperature on both hole and vacancy concentrations is derived quantitatively from earlier renormalization group calculations for the non--dilute case, and the results reproduce experimental data with no new adjustable parameters.