2001/11/30 by Masafumi Ito, Hiroshi Harashina, Yukio Yasui +5
Physics and Astronomy · #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #Theoretical and Computational Physics #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1143/jpsj.71.265
published as J. Phys. Soc. Jpn. 71 (2002) 265 · 12 pages, 6 figures, J. Phys. Soc. Jpn. 71 (2002) No.1 265
openalex publication_date 2002/01/01 · arxiv created 2002/04/02 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Detailed structure of the magnetic excitation spectra x"(q,w) of the superconducting oxide YBa2Cu3O6.5(the transition temperature Tc ~ 52 K) 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 ~ 40 meV for the optimally doped system of YBa2Cu3Oy can be naturally reproduced by the present model