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Microscopic Theory of the Two-Dimensional Quantum Antiferromagnet in a Paramagn...

We have developed a consistent theory of the Heisenberg quantum antiferromagnet in the disordered phase with a short range antiferromagnetic order on the basis of the path integral for spin coherent states. In the framework of our approach we have obtained the response function for the spin fluctuations for all values of the frequency [omega] and the wave vector k and have calculated the free energy of the syst...