Nanoscale textured superconductivity in Ru-substituted BaFe2As2 : a challenge to a universal phase diagram for the pnictides
Yannis Laplace, Julien Bobroff, Veronique Brouet, Gaston Collin,, Florence Rullier-Albenque, Dorothee Colson, Anne Forget
TL;DR
This study reveals nanoscale textured superconductivity in Ru-doped BaFe2As2, showing inhomogeneous magnetic suppression and coexistence with superconductivity, which questions the universality of the phase diagram in Fe-based superconductors.
Contribution
It demonstrates that Ru substitution induces nanoscale textured superconductivity and inhomogeneous magnetic suppression, challenging the universal phase diagram concept for pnictides.
Findings
Ru substitution destroys AF order inhomogeneously
Superconductivity coexists with AF order at small magnetic moments
Nanoscale texture differs from Co substitution effects
Abstract
75As NMR experiments were performed in Ba(Fe1-xRux)2As2 for x=0 to 80%. Magnetic fractions and NMR lineshapes demonstrate that Ru substitution destroys the antiferromagnetic (AF) order inhomogeneously with a magnetic moment distributed from 0.9 to 0 uB. Superconductivity emerges at intermediate Ru doping and coexists with AF order only in the regions where moments are smaller than ~0.3uB, resulting in an original nanoscale texture. This situation contrasts with that of Co substitution, challenging the apparent universality of the phase diagram in Fe-based superconductors.
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