Article Dans Une Revue Physical Review Letters Année : 2009

Hall effect and resistivity study of the magnetic transition, carrier content, and fermi-liquid behavior in Ba(Fe1-xCox)2As2

F. Rullier-Albenque
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D. Colson
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A. Forget
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Résumé

The negative Hall constant RH measured all over the phase diagram of Ba(Fe1-xCox)2As2 allows us to show that electron carriers always dominate the transport properties. The evolution of RH 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, a change with T of the electron concentration is required to explain the low T variations of RH, while the electron scattering rate displays the T2 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.

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Dates et versions

hal-04896724 , version 1 (20-01-2025)

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F. Rullier-Albenque, D. Colson, A. Forget, H. Alloul. Hall effect and resistivity study of the magnetic transition, carrier content, and fermi-liquid behavior in Ba(Fe1-xCox)2As2. Physical Review Letters, 2009, 103 (5), ⟨10.1103/PhysRevLett.103.057001⟩. ⟨hal-04896724⟩
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