Abstract
The superconducting (SC) R2-xCexRuSr2Cu2O10-δ (R = Eu and Gd) materials (TC∼ 36 and 42 K for x = 0.5) are also weak-ferromagnets with TM∼ 124 and 180 K respectively. TM>>TC, a trend which is contrary to that obtained in most “magnetic-SC” intermetallic systems. Various experimental techniques show that magnetism is due to the Ru sublattice, whereas SC is confined to the CuO2 planes. The hole doping in these planes, with resulting metallic behavior and SC, can be achieved with appropriate variation of the R/Ce ratio. Among many interesting features, irreversibility phenomena at low magnetic fields and spin reorientation transition are observed. These probably originate from antisymmetric exchange coupling of the Dzyaloshinsky-Moria type. Below TC, the decay of the remanent moment as a function of temperature and/or time is logarithmic. On the other hand, above TC a non-logarithmic relaxation rate of the remanent moment is observed. Vortices are present in the samples in equilibrium without an external field, indicating the predicted “spontaneous vortex phase”.
Published Version
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.
