Superfluid density and field-induced magnetism in Ba(Fe1-xCox)(2)As-2 and Sr(Fe1-xCox)(2)As-2 measured with muon spin relaxation

TitleSuperfluid density and field-induced magnetism in Ba(Fe1-xCox)(2)As-2 and Sr(Fe1-xCox)(2)As-2 measured with muon spin relaxation
Publication TypeJournal Article
Year of Publication2010
AuthorsWilliams TJ, Aczel AA, Baggio-Saitovitch E, Bud'ko SL, Canfield PC, Carlo JP, Goko T, Kageyama H, Kitada A, Munevar J, Ni N, Saha SR, Kirschenbaum K, Paglione J, Sanchez-Candela DR, Uemura YJ, Luke GM
Journal TitlePhysical Review B
Volume82
Pages094512
Date Published09/20
ISBN Number1098-0121
Accession NumberISI:000282004700006
Keywordscuprate superconductors, excitations, heat, penetration depth, rotation, TC, tl2ba2cuo6+delta, vortex cores
Abstract

We report muon spin rotation (mu SR) measurements of single-crystal Ba(Fe1-xCox)(2)As-2 and Sr(Fe1-xCox)(2)As-2. From measurements of the magnetic field penetration depth lambda we find that for optimally and overdoped samples, 1/lambda(T -> 0)(2) varies monotonically with the superconducting transition temperature T-C. Within the superconducting state we observe a positive shift in the muon precession signal, likely indicating that the applied field induces an internal magnetic field. The size of the induced field decreases with increasing doping but is present for all Co concentrations studied.

URL<Go to ISI>://000282004700006
DOI10.1103/Physrevb.82.094512