Skip to Main content Skip to Navigation
Journal articles

Longitudinal magnetoresistance in Co-doped BaFe 2 As 2 and LiFeAs single crystals: Interplay between spin fluctuations and charge transport in iron pnictides

F. Rullier-Albenque 1 D. Colson 1 A. Forget 1
1 LNO - Laboratoire Nano-Magnétisme et Oxydes
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
Abstract : The longitudinal in-plane magnetoresistance (LMR) has been measured in different Ba(Fe1−xCox)2As2 single crystals and in LiFeAs. For all these compounds, we find a negative LMR in the paramagnetic phase whose magnitude increases as H 2. We show that this negative LMR can be readily explained in terms of suppression of the spin fluctuations by the magnetic field. In the Co-doped samples, the absolute value of the LMR coefficient is found to decrease with doping content in the paramagnetic phase. The analysis of its T dependence in an itinerant nearly antifer-romagnetic Fermi liquid model evidences that the LMR displays a qualitative change of T variation with increasing Co content. The latter occurs at optimal doping for which the antiferromagnetic ground state is suppressed. The same type of analysis for the negative LMR measured in LiFeAs suggests that this compound is on the verge of magnetism.
Document type :
Journal articles
Complete list of metadatas

https://hal-cea.archives-ouvertes.fr/cea-01440314
Contributor : Dominique Girard <>
Submitted on : Thursday, January 19, 2017 - 11:19:23 AM
Last modification on : Friday, April 24, 2020 - 10:28:07 AM
Long-term archiving on: : Thursday, April 20, 2017 - 12:51:32 PM

File

1303.1677v2.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

F. Rullier-Albenque, D. Colson, A. Forget. Longitudinal magnetoresistance in Co-doped BaFe 2 As 2 and LiFeAs single crystals: Interplay between spin fluctuations and charge transport in iron pnictides. Physical Review B: Condensed Matter and Materials Physics, American Physical Society, 2013, 88 (4), pp.45105. ⟨10.1103/PhysRevB.88.045105⟩. ⟨cea-01440314⟩

Share

Metrics

Record views

169

Files downloads

297