On the determination of the quasiparticle scattering rate in unconventional superconductors by microwave surface impedance
arXiv:1310.5608 · doi:10.1063/1.4830422
Abstract
In the approximation of validity of the Drude expression for quasiparticle conductivity and the assumption that all electrons at T = 0 transform into a superfluide condensate, the expression for the quasiparticle scattering rate tau -1 in terms of the real and imaginary parts of the microwave surface impedance has been obtained. The resulting expression is a generalization of the well-known expression for tau^-1, valid for omega x tau is much less 1, to an arbitrary value of omega x tau, where omega is the frequency of the microwave field. From experimental Ka-band impedance measurements, temperature dependence of tau^-1 in superconducting single crystal pnictides Ba(Fe1-xCox)2As2 is obtained using the generalized expression. It is shown that under condition of the given work, the approximation omega x tau is much less 1 gives the considerable error in determination of tau^-1.
3 pages, 1 figure
References in corpus (11)
- Superconductivity in Iron Compounds
- Gap symmetry and structure of Fe-based superconductors
- Microwave Penetration Depth and Quasiparticle Conductivity in PrFeAsO_1-y Single Crystals : Evidence for a Full-Gap Superconductor
- London Penetration Depth in Iron - based Superconductors
- Microwave Surface-Impedance Measurements of the Magnetic Penetration Depth in Single Crystal Ba1-xKxFe2As2 Superconductors: Evidence for a Disorder-Dependent Superfluid Density
- Unconventional London penetration depth in Ba(Fe0.93Co0.07)2As2 single crystals
- The London penetration depth in single crystals of Ba(Fe_{1-x}Co_x)_2As_2 at various doping levels
- Local measurement of the superfluid density in the pnictide superconductor Ba(FeCo)As across the superconducting dome
- Anomalous Temperature Dependence of the Superfluid Density Caused by Dirty-to-Clean Crossover in FeSeTe Single Crystals
- Phenomenology of a-axis and b-axis charge dynamics from microwave spectroscopy of highly ordered YBa2Cu3O6.50 and YBa2Cu3O6.993
- Millimeter-wave study of London penetration depth temperature dependence in Ba(Fe0.926Co0.074)2As2 single crystal