We calculate the spin-Knight shifts and the nuclear relaxation rates of the Cu and O ions in the superconducting state of YBa2Cu3O7, using a layer model in which some pairing interaction generates superconductivity in the CuO2-plane layers and the interlayer transfer interaction induces weak superconductivity in other layers. If the experimental values of the spin-Knight shift and the nuclear relaxation rate are normalized at Tc, these values for the Cu and O ions in each layer are on universal curves in all temperature range of the superconducting state. The normalized spin-Knight shifts and relaxation rates of the Cu and O ions in the plane layer decrease much faster than those in the chain layer in the superconducting state. The present theoretical result well explains the temperature dependence of the normalized spin-Knight shift and nuclear relaxation rate.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering