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Physics  1995 

Universal Charge and Spin Response in Optimally Doped Antiferromagnets

DOI: 10.1103/PhysRevLett.75.1340

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Charge and spin response in the planar $t-J$ model at finite temperatures are investigated numerically, in the regime corresponding to cuprates at intermediate doping. We show that the local spin correlation function is $T$-independent, leading to $\chi''(\omega


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