Spin susceptibility of cuprates in the model of a 2D frustrated antiferromagnet: Role of renormalization of spin fluctuations in describing neutron experiments

Journal Article · Wed Aug 15 04:00:00 EDT 2007 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776107080079· OSTI ID:21075730

Mikheenkov, A V

Experimental data on the spin susceptibility of HTSC cuprates are reproduced on the basis of a spherically symmetric approach in the frustrated Heisenberg model. The inclusion of real and imaginary renormalizations in spin Green's functions makes it possible to explain the evolution of spin excitation spectrum {omega}(q) and susceptibility spectrum {chi}(q, {omega}) in the range from insulator to optimal doping. In the low-frustration limit corresponding to the weakly doped mode, the saddle singularity of {omega}(q) and scaling of {chi}{sub 2D}({omega}) ={integral}dq Im {chi}(q, {omega}) are reproduced and an analytic expression is derived for the scaling function. In the strong frustration (optimal doping) mode, the stripe scenario is demonstrated; this leads to a peak of {chi}{sub 2D} ({omega}) in the region of {omega}{approx}60 meV.

• OSTI ID: 21075730
• Journal Information: Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 2 Vol. 105; ISSN JTPHES; ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CUPRATES
DOPED MATERIALS
EXCITATION
FLUCTUATIONS
GREEN FUNCTION
HEISENBERG MODEL
NEUTRONS
RENORMALIZATION
SINGULARITY
SPIN
TWO-DIMENSIONAL CALCULATIONS