期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 71, 期 1, 页码 265-270出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.71.265
关键词
YBa2Cu3Oy; magnetic excitation spectra; neutron scattering
Detailed structure of the magnetic excitation spectra X(q, w) of the superconducting oxide YBa2CU3O6.5 (the transition temperature T-c congruent to 52K) in the wave vector (q)- and the energy (w)-space, and its temperature (T) dependence have been studied. By adopting an effective energy dispersion of the quasi particles which can reproduce the shape of the Fermi surface and by introducing the exchange interaction between the Cu spins, a rather satisfactory agreement between the calculation and the experimentally observed data can be obtained. In the study, it has been found that the effects of the quasi particle-energy broadening on the excitation spectra X(q, w) is important. The sharp resonance peak observed at w similar to 40 meV for the optimally doped system of YBa2CU3Oy can be naturally reproduced by the present model.
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