Physics – Condensed Matter – Superconductivity
Scientific paper
2009-03-30
PRL 103,057001 (2009)
Physics
Condensed Matter
Superconductivity
5 pages, 4 figures, published version
Scientific paper
10.1103/PhysRevLett.103.057001
The negative Hall constant R_H measured all over the phase diagram of Ba(Fe(1-x)Cox)2As2 allows us to show that electron carriers always dominate the transport properties. The evolution of R_H with x at low doping (x<2%) indicates that important band structure changes happen for x<2% prior to the emergence of superconductivity. For higher x, an change of the electron concentration with T is required to explain the low T variations of R_H, while the electron scattering rate displays the T^2 law expected for a Fermi liquid. The T=0 residual scattering is affected by Co disorder in the magnetic phase, but is rather dominated by incipient disorder in the paramagnetic state.
Alloul Henri
Colson Dorothee
Forget Anne
Rullier-Albenque Florence
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