Competing frustration and dilution effects on the antiferromagnetism in La2-xSrxCu1-zZnzO4

The combined effects of hole doping and magnetic dilution on:a lamellar Hei senberg antiferromagnet are studied in the framework of the frustration mod el. Magnetic vacancies are argued to remove some of the frustrating bonds g enerated by the holes, thus explaining the increase in the temperature and concentration ranges exhibiting three-dimensional long-range order. The dep endence of the Neel temperature on both hole and vacancy concentrations is derived quantitatively from-earlier renormalization-group calculations for the nondilute case, and the results reproduce experimental data with no new adjustable parameters. [S0163-1829(99)51046-1].