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We present the theory of two-dimensional, clean quantum antiferromagnets with a small, positive, zero temperature (T ) stiffness ρs, but with the ratio kBT/ρs arbitrary. Universal scaling forms for the uniform susceptibility (χu), correlation length(ξ), and NMR relaxation rate (1/T1) are proposed and computed in a 1/N expansion and by Monté-Carlo simulations. For large kBT/ρs, χu(T )/T and Tξ(T ) asymptote to universal values, while 1/T1(T ) is nearly T -independent. We find good quantitative agreement with experiments and some numerical studies on La2−δSrδCuO4.

physical review letters

Universal Magnetic Properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi><mml:mrow><mml:msub><mml:mrow><…

Universal Magnetic Properties ofLa2−δSrδCu<…