Low Temperature Physics: 32, 375 (2006); https://doi.org/10.1063/1.2199438 (5 pages)
Физика Низких Температур: Том 32, Выпуск 4-5 (Апрель 2006), c. 499-504    ( к оглавлению , назад )

Spin dynamics in cuprate perovskites

A. Sherman1 and M. Schreiber2

1Institute of Physics, University of Tartu, Riia 142, Tartu, 51014 Estonia
E-mail: alexei@fi.tartu.ee

2Institut für Physik, Technische Universitüt, D-09107 Chemnitz, Germany
E-mail: schreiber@physik.tu-chemnitz.de

Received June 8, 2005


Results obtained with the use of the t–J model of Cu–O planes and Mori’s projection operator formalism are compared with data of neutron scattering experiments in lanthanum and yttrium cuprates. This comparison allows us to interpret the intensive peak at the antiferromagnetic wave vector observed in yttrium cuprates as a manifestation of excitations of localized Cu spins. The high-frequency incommensurability detected both in lanthanum and yttrium cuprates is connected with the dispersion of these excitations, while the low-frequency incommensurability arises due to a dip in the spin-excitation damping at the antiferromagnetic wave vector. For moderate doping the dip stems from the weakness of the interaction between the spin excitations and holes near hot spots. It is conjectured that the dissimilarity of the susceptibility frequency dependencies in yttrium and lanthanum cuprates may be connected with different values of the hole bandwidth and damping in these crystals.

71.10.Fd - Lattice fermion models (Hubbard model, etc.)
74.25.Ha - Magnetic properties
74.72.-h - Cuprate superconductors (high-Tc and insulating parent compounds)

Key words: spin dynamics, dispersion of spin excitation.