Physics – Condensed Matter
Scientific paper
1996-06-24
Phys. Rev. B 54 (1996) 7614
Physics
Condensed Matter
4 pages, 1 Postscript figure, revtex-style, accepted for publishing: Phys. Rev. B, 54, ... (1996)
Scientific paper
10.1103/PhysRevB.54.7614
The uniform static spin susceptibility in the paraphase of the one-band Hubbard model is calculated within a theory of magnetic short--range order (SRO) which extends the four-field slave-boson functional-integral approach by the trans- formation to an effective Ising model and the self-consistent incorporation of SRO at the saddle point. This theory describes a transition from the paraphase without SRO for hole dopings $\delta > \delta_{c_2}$ to a paraphase with anti- ferromagnetic SRO for $\delta_{c_1} < \delta < \delta_{c_2}$. In this region the susceptibility consists of interrelated `itinerant' and `local' parts and increases upon doping. The zero--temperature susceptibility exhibits a cusp at $\delta_{c_2}$ and reduces to the usual slave-boson result for larger dopings. Using the realistic value of the on--site Coulomb repulsion $U=8t$ for LSCO, the peak position ($\delta_{c_2} = 0.26$) as well as the doping dependence reasonably agree with low--temperature susceptibility experiments showing a maximum at a hole doping of about 25\%.
Fehske Holger
Ihle Dieter
Trapper U.
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