Universality of Charge and Spin Response in Doped Antiferromagnets

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dc.creatorPrelovsek, P.
dc.creatorJaklic, J.
dc.date1996-01-18
dc.date.accessioned2026-07-07T03:08:09Z
dc.date.available2026-07-07T03:08:09Z
dc.descriptionRecent results for the finite-temperature static and dynamical properties of the planar $t-J$ model, obtained by a novel numerical method for small correlated systems, are reviewed. Of particular interest are $T>0$ charge and spin response functions: optical conductivity $σ(ω)$ and spin susceptibility $χ(\vec q,ω)$, which show very universal features at intermediate doping. In spin dynamics the universality is best seen in the local spin correlation function, which appears to be $T$-independent and only weakly doping dependent. Results apply directly to the inelastic neutron scattering and to the NMR relaxation experiments in cuprates. Analysing $σ(ω)$ we find that the current correlation function $C(ω)$ is nearly $T$- and moreover $ω$-independent in the regime $T <J$, leading to the $σ(ω)$ behavior, very close to the marginal Fermi liquid concept and experiments. These properties are interpreted in connection with the large entropy, related to the large degeneracy of the low-lying states and quantum frustration in the doped antiferromagnets. On the other hand, results for the uniform susceptibility $χ_0(T)$, as well as for the $σ(ω)$, reveal qualitative changes on entering the underdoped regime.
dc.description7 pages with 5 Postscript figures, RevTeX and epsf required. Presented on the Pacific Conference on Condensed Matter Physics "Complex Materials and Strong Correlation" in Seoul, December 1995
dc.identifierhttps://arxiv.org/abs/cond-mat/9601073
dc.identifierhttp://arxiv.org/abs/cond-mat/9601073
dc.identifierJ. Korean Phys. Soc. 29, 63 (1996)
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/27444
dc.subjectCondensed Matter
dc.titleUniversality of Charge and Spin Response in Doped Antiferromagnets
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