Low Temperature Physics: 32, 320 (2006); https://doi.org/10.1063/1.2199431 (20 pages)
Физика Низких Температур: Том 32, Выпуск 4-5 (Апрель 2006), c. 430-454    ( к оглавлению , назад )

Dynamic properties of inhomogeneous states in cuprates

J. Lorenzana1 and G. Seibold2

1SMC-INFM,ISC-CNR, Dipartimento di Fisica, Universitá di Roma "La Sapienza", P. Aldo Moro 2, 00185 Roma, Italy

2Institut für Physik, BTU Cottbus, PBox 101344, 03013 Cottbus, Germany
E-mail: lorenzana.jose@gmail.com

Received October 26, 2005

Аннотация

We review the static and dynamical properties of stripe textures with regard to their relevance in high-Tc superconductors. Our investigations are based on the time-dependent Gutzwiller approximation which allows for the computation of random-phase approximation-like (RPA) fluctuations on top of the Gutzwiller approximation (GA). No restrictions are imposed on the charge and spin configurations which makes the method suitable for the calculation of linear excitations around symmetry-broken solutions. Within this approach we calculate the optical conductivity of stripes and compare our results with reflectivity experiments on cuprates. Furtheron we use the spin-rotational invariant extension of the GA + RPA method in order to investigate the characteristics of magnetic excitations in the stripe phase of cuprates. Our results are in very good agreement with neutron scattering and optical experiments on lanthanum cuprate superconductors.

PACS:
71.10.-w - Theories and models of many-electron systems
71.27.+a - Strongly correlated electron systems; heavy fermions
71.45.Gm - Exchange, correlation, dielectric and magnetic response functions, plasmons

Ключевые слова: textures, high-Tc superconductivity, linear excitations.