Theory of magnetic short-range order for itinerant electron systems

U. Trapper; D. Ihle; H. Fehske

doi:10.1142/s0217979297000691

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Theory of magnetic short-range order for itinerant electron systems

U. Trapper·D. Ihle·H. Fehske

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Abstract

On the basis of the one--band t-t'-Hubbard model a self-consistent renormalization theory of magnetic short--range order (SRO) in the paramagnetic phase is presented combining the four-field slave-boson functional-integral scheme with the cluster variational method. Contrary to previous SRO approaches the SRO is incorporated at the saddle-point and pair-approximation levels. A detailed numerical evaluation of the theory is performed at zero temperature, where both the hole- and electron-doped cases as well as band-structure effects are studied. The ground--state phase diagram shows the suppression of magnetic long-range order in favour of a paramagnetic phase with antiferromagnetic SRO in a wide doping region. In this phase the uniform static spin susceptibility increases upon doping up to the transition to the Pauli paraphase. Comparing the theory with experiments on high--T_c cuprates a good agreement is found.

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U. Trapper, D. Ihle, H. Fehske. 1996-09-02. Theory of magnetic short-range order for itinerant electron systems. https://doi.org/10.1142/s0217979297000691

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