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We study a quenched disordered d=3 tJ Hamiltonian with static vacancies as amodel of nonmagnetic impurities in high-Tc materials. Using a position-spacerenormalization-group approach, we calculate the evolution of thefinite-temperature phase diagram with impurity concentration p, and findseveral features with close experimental parallels: away from half-filling wesee the rapid destruction of a spin-singlet phase (analogous to thesuperconducting phase in cuprates) which is eliminated for p > 0.05; in thesame region for these dilute impurity concentrations we observe an enhancementof antiferromagnetism. The antiferromagnetic phase near half-filling is robustagainst impurity addition, and disappears only for p > 0.40.Comment: 5 pages, 4 figures; replaced with published versio

physical review. b, condensed matter and materials physics

Finite-temperature phase diagram of nonmagnetic impurities in high-temperature superconductors using a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>d</mml:mi><mml:mo>=</mml:mo><mml:mn>3</mml:mn><mml:mtext> </mml:mtext><mml:mi>t</mml:mi><mml:mi>J</mml:mi></mml:mrow></mml:math>model with quenched disorder

Finite-temperature phase diagram of nonmagnetic impurities in high-temperature superconductors using ad=3 tJmodel with quenched disorder