Spin-wave resonance in a superconductor with paramagnetic impurities
Goryunov Yu. V. , Khaliullin G. G., Garifullin I. A.
An anomalous distortion of the ESR lineshape has been observed in thin La! _. χΈχχ films with a transition to the superconducting state. This effect is explained by the appearance of collective spin-wave excitations of paramagnetic impurities in a magnetic field.