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

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.

4 pages, 2 figures

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