Microwave absorption in YBa2Cu3O7−δ-manganite superlattices

Abstract

We report on results of direct microwave absorption measurements of Re 1−x B x MnO 3 /YBa 2 Cu 3 O 7−δ half metal/d-wave superconductor superlattices (where Re-La and Pr) and (B-Sr and Ca) for microwave frequencies in the range from 9 to 20 GHz. The measurements of the entire heterostructure were performed mostly at temperatures below the superconducting transition. The obtained results strongly depend on the microwave frequency and can be qualitatively described within the theoretical model of high-frequency properties of Josephson junctions with a ferromagnetic barrier proposed by S.

Signature of the Spin Triplet Phase in La0.7Sr0.3MnO3/Yba2Cu3O7/La0.7Sr0.3MnO3Trilayers

“…Similar results were obtained on another set of samples including the description of interface properties which play a significant role in the subgap transport [11]. The appearance of spin triplet phase was demonstrated also by means of microwave absorption measurements in LSMO/YBCO superlattices [12] indicating a strong frequency dependence in qualitative agreement with theoretical model [5].…”