| Issue |
EPL
Volume 93, Number 3, February 2011
|
|
|---|---|---|
| Article Number | 37002 | |
| Number of page(s) | 6 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/93/37002 | |
| Published online | 09 February 2011 | |
Anisotropic charge dynamics in detwinned Ba(Fe1-xCox)2As2
1
Laboratorium für Festkörperphysik, ETH - Zürich, CH-8093 Zürich, Switzerland
2
Geballe Laboratory for Advanced Materials and Department of Applied Physics, Stanford University Stanford, CA 94305-4045, USA
3
Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory 2575 Sand Hill Road, Menlo Park, CA 94025, USA
Received:
6
January
2011
Accepted:
24
January
2011
We investigate the optical conductivity with light polarized along the in-plane orthorhombic a and b axes of Ba(Fe1−xCox)2As2 for x=0 and 2.5% under uniaxial pressure across their structural and magnetic transitions. The charge dynamics at low frequencies and temperatures on these detwinned, single-domain samples reveals an enhancement of both the scattering rate and Drude weight of the charge carriers along the antiferromagnetic a-axis with respect to the ferromagnetic b-axis. Our findings also allow us to estimate the dichroism, which extends to high frequencies and temperatures. These results reveal a nematic susceptibility as well as the electronic nature of the structural transition.
PACS: 74.70.Xa – Pnictides and chalcogenides / 78.20.-e – Optical properties of bulk materials and thin films
© EPLA, 2011
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