Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1997-10-08
J. Phys. Chem. Solids 59, 1811 (1998)
Physics
Condensed Matter
Strongly Correlated Electrons
3 pages, 4 eps-figures included, uses revtex, epsf
Scientific paper
10.1016/S0022-3697(98)00111-5
The dynamical spin susceptibility chi'' at wave vector (pi, pi) and the spectrum pi'' of the spin-triplet particle--particle excitation with center of mass momentum (pi, pi) (pi-excitation) are considered in the slave-boson formulation of the t--J-model. Propagators are calculated in a diagrammatic t-matrix approximation in the d-wave superconducting state for a wide doping range. The resulting spectra chi'' and pi'' both show a resonance at a doping dependent energy, in qualitative agreement with recent numerical cluster calculations. In underdoped systems, the peak position is comparable to that found in neutron scattering experiments. The peak in chi'' as well as pi'' is at low doping entirely caused by spin fluctuations, whereas the triplet particle--particle channel does not contribute as a collective mode.
Brinckmann Jan
Lee Patrick A.
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