Charge doping-induced quasiparticle scattering in iron-pnictide superconductors as probed by vortex pinning

Details Charge doping-induced quasiparticle scattering in iron-pnictide superconductors as probed by vortex pinning Charge doping-induced quasiparticle scattering in iron-pnictide superconductors as probed by vortex pinning

2010-05-12

arxiv.org/abs/1005.2129v2

Phys. Rev. Lett. 105, 267002 (2010)

Physics

Condensed Matter

Superconductivity

4 pages

Scientific paper

10.1103/PhysRevLett.105.267002

Charge doping of iron-pnictide superconductors leads to collective pinning of flux vortices, whereas isovalent doping does not. Moreover, flux pinning in the charge-doped compounds is consistently described by the mean-free path fluctuations introduced by the dopant atoms, allowing for the extraction of the elastic quasiparticle scattering rate. The absence of scattering by dopant atoms in isovalently doped BaFe$_{2}$(As$_{1-x}$P$_{x}$)$_{2}$ is consistent with the observation of a linear temperature dependence of the low-temperature penetration depth in this material.

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