The Magnetic Excitation Spectrum and Thermodynamics of High-Tc Superconductors
Inelastic neutron scattering was used to study the wave vector- and frequency-dependent magnetic fluctuations in single crystals of superconducting YBa2Cu3O6+x. The spectra contain several important features, including a gap in the superconducting state, a pseudogap in the normal state, and the much-discussed resonance peak. The appearance of the pseudogap determined from transport and nuclear resonance coincides with formation of the resonance in the magnetic excitations. The exchange energy associated with the resonance has the temperature and doping dependences as well as the magnitude to describe approximately the electronic specific heat near the superconducting transition temperature (Tc).
P. Dai et al., "The Magnetic Excitation Spectrum and Thermodynamics of High-Tc Superconductors," Science, vol. 284, no. 5418, pp. 1344-1347, American Association for the Advancement of Science, May 1999.
The definitive version is available at http://dx.doi.org/10.1126/science.284.5418.1344
Materials Science and Engineering
Keywords and Phrases
Doping (additives); Magnetic resonance; Neutron scattering; Oxide superconductors; Single crystals; Specific heat of solids; Superconducting transition temperature; Yttrium barium copper oxides; Magnetic excitations; Magnetic fluctuations
International Standard Serial Number (ISSN)
Article - Journal
© 1999 American Association for the Advancement of Science, All rights reserved.