This article is cited in 3 papers

CONDENSED MATTER

Phenomenological approach to the non-spin-wave behavior of cuprate magnetic susceptibility in the superconducting state

A. F. Barabanov^a, L. A. Maksimov<sup>b

a</sup> Institute of High-Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow region, 142190, Russia
^b Russian Research Centre Kurchatov Institute, pl. Kurchatova, Moscow, 123182, Russia

Abstract: Experimental data on the non-spin-wave behavior of the cuprate magnetic susceptibility χ(q, ω) in the superconducting state are reconstructed on the basis of a spherically symmetric self-consistent approach within the framework of the frustrated Heisenberg model. For the Green’s function of the spin-wave excitations, a polarization operator resonant with the superconducting state is introduced phenomenologically. This gives rise to an additional (compared to the normal state) branch of the incommensurate peaks and to a pronounced non-spin-wave behavior of the susceptibility χ(q, ω) in the frequency range near 80 meV (the so-called “dark region”). The renormalization of the real part of the polarization operator plays a crucial role in the theory.

PACS: 71.27.+a, 74.72.-h, 75.20.-g

Received: 26.02.2008

 English version: Journal of Experimental and Theoretical Physics Letters, 2008, 87:7, 371–375

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