Abstract
The spin dynamics of paramagnetic impurities in a superconductor in the presence of external magnetic field has been studied both theoretically and experimentally. Long-wave excitations (q≤ξ−1, where ξ is the coherence length) are shown to have coherent spin-wave nature even in a paramagnetic phase. This effect is caused by the long-range (R∼ξ) indirect exchange interaction between localized spins in a superconductor. The spin-wave effects in EPR of Er3+ ions in the superconducting (SC) La1−xErx thin films have been observed. An additional absorption at the high field side of the main resonance line which leads to its distortion has been found. Satisfactory description of all features of observed spectra was obtained by simulating the spectra with account for the microwave absorption by spin-wave excitations. The spin stiffness coefficient and the temperature dependence of the spin susceptibility of the SC lanthanum has been determined.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
