Electron spin resonance in superconducting materials |
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Authors: | K. Baberschke |
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Affiliation: | (1) Institut für Atom- und Festkörperphysik, Freie Universität Berlin, Boltzmannstraße 20, D-1000 Berlin 33, Germany |
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Abstract: | The ESR of Gd in the superconducting phase of the type II superconductors CeRu2 and LaOs2 shows a shift for the field for resonance and inhomogeneous broadening of the lineshape. Both effects strongly depend on the three different microwave frequencies (resp. magnetic fields). The broadening of max. 800 G is attributed to a non resolved finestructure splitting. The local field distribution in vortex state of these type II superconductors is less than 100 G and is the main contribution for shift of the field for resonance. In addition ESR results of Gd and Eu doped into La are discussed forT >Tc. The comparison of depression of the superconducting transition temperature and exchange spin-flip scattering rate determined from ESR shows a perfect agreement. |
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