Localized and itinerant dichotomy of electrons in Ba(Fe,Co)2As2

Details Localized and itinerant dichotomy of electrons in Ba(Fe,Co)2As2 Localized and itinerant dichotomy of electrons in Ba(Fe,Co)2As2

2011-02-27

arxiv.org/abs/1102.5476v1

Physics

Condensed Matter

Superconductivity

4 figures

Scientific paper

Variant approaches, either based on the Fermi surface nesting or started from the proximity to a Mott-insulator, were proposed to elucidate the physics in iron pnictides, but no consensus has been reached. A fundamental problem concerns the nature of their 3d electrons. Here we report the magnetoresistivity (\rho_xx) and the Hall resistivity (\rho_xy) of Ba(Fe1-xCox)2As2 (x=0 and 0.05) in a magnetic field of up to 55T. The magnetic transition is extremely robust against magnetic field, giving strong evidence that the magnetic ordering is formed by local moments. The magnetic state is featured with a huge magnetoresistance and a distinguished Hall resistivity, \rho_xy(H), which shows a pronounced parabolic field dependence, while the paramagnetic state shows little magnetoresistance and follows a simple linear magnetic field dependence on the Hall resistivity. Analyses of our data, based on a two-carrier model, demonstrate that the electron carriers in the magnetic state rapidly increase upon applying a magnetic field, partially compensating the loss of electron carriers at T_M. We argue that the 3d-electrons in Ba(Fe1-xCox)2As2 are divided into those who are close to forming localized moments controlling the magnetic transition and the others giving rise to complex transport properties through their interaction with the former.

Affiliated with

Also associated with

No associations

Rating

Localized and itinerant dichotomy of electrons in Ba(Fe,Co)2As2 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Localized and itinerant dichotomy of electrons in Ba(Fe,Co)2As2, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Localized and itinerant dichotomy of electrons in Ba(Fe,Co)2As2 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-53889