Resonant spin excitations in high- T c cuprates: Influence of the pseudogap

• Published in: Physica. C, Superconductivity Vol. 460; pp. 1133 - 1134
• Main Authors: Ismer, J.-P., Eremin, I., Morr, D.K.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.09.2007
• Subjects: High- Tc cuprates; Inelastic neutron scattering; Spin susceptibility; 71.10.Ca; High- T c cuprates; 74.20.Fg; Spin susceptibility; Inelastic neutron scattering; 74.25.Ha
• ISSN: 0921-4534; 1873-2143
• DOI: 10.1016/j.physc.2007.03.300

We analyze the formation of the so-called resonance peak, in 3 different ordered states: the d x 2 - y 2 -wave superconducting (DSC) phase, the d-density wave (DDW) state, and a phase with coexisting DDW and DSC order. In particular, in the DDW state, we find that a nearly dispersionless resonance excitation exists only in a narrow region around Q = (π,π). At the same time, in the coexisting DDW and DSC state, the dispersion of the resonance peak near Q is significantly changed from that in the pure DSC state. Away from (π,π), however, we find that the form and dispersion of the resonance excitation in the coexisting DDW and DSC state and pure DSC state are quite similar.