2012/09/28 by G. Prando, Giacomo Prando, S. Sanna +10
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Intellectual Capital and Performance Analysis #Iron-based superconductors research #Rare-earth and actinide compounds #cond-mat.supr-con
paper · pdf · doi:10.1002/pssb.201200767
published as Phys. Status Solidi B 250, 599 (2013) · Proceedings of QCNP12 Conference
arxiv created 2012/09/28 · openalex publication_date 2013/01/14 · arxiv updated 2013/04/05 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Abstract In this paper we report a detailed µ + SR and 19 F NMR study of the La 0.7 Y 0.3 FeAsO 1− x F x class of materials. Here, the diamagnetic La 1− y Y y substitution increases chemical pressure and, accordingly, sizeably enhances the optimal superconducting transition temperature. We investigate the magnetic–superconducting phase transition by keeping the Y content constant ( y = 0.3) and by varying the F content in the range 0.025≤ x≤ 0.15 . Our results show how magnetism and superconductivity coexist for x = 0.065. Such coexistence is due to segregation of the two phases in macroscopic regions, resembling what was observed in LaFeAsO 1− x F x materials under applied hydrostatic pressure. This scenario is qualitatively different from the nanoscopic coexistence of the two order parameters observed when La is fully substituted by magnetic rare‐earth ions like Sm or Ce.