Upper critical field of the magnetic superconductor (formula presented)

M. T. Escote, V. A. Meza, R. F. Jardim*, L. Ben-Dor, M. S. Torikachvili, A. H. Lacerda

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

We performed measurements of magnetic susceptibility, electrical resistivity, and magnetoresistance in magnetic fields of up to 18 T in the magnetic superconductor (formula presented) synthesized in oxygen pressures up to 95 atm. The magnetic-susceptibility data show the occurrence of an antiferromagnetic state below (formula presented) followed by the development of a weak ferromagnetic state near (formula presented) and followed further by the onset of superconductivity (SC) at (formula presented) The electrical resistivity as a function of temperature shows an evolution from nonmetal-to-SC behavior in samples prepared in a flux of (formula presented) to a well defined metal-like behavior in samples prepared under 95 atm pressure of (formula presented) The electron-phonon coupling constant was calculated from transport data to be (formula presented) a value comparable with other cuprates, indicating weak electron-phonon coupling in these ruthenates. The values of the upper critical field (formula presented) for the (formula presented) high-pressure treated samples were obtained from the magnetoresistivity data yielding (formula presented) and the out-of-plane superconducting coherence length (formula presented) Based on the similarities between these ruthenates and the superconductor (formula presented) we estimated (formula presented) and (formula presented) We used these parameters to discuss the coexistence of long-range magnetic order and superconductivity on a microscopic scale on these materials.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number14
DOIs
StatePublished - 2002

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