Journal
EPL
Volume 93, Issue 3, Pages -Publisher
EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY
DOI: 10.1209/0295-5075/93/37002
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Funding
- Swiss National Foundation for the Scientific Research within the NCCR
- Department of Energy, Office of Basic Energy Sciences [DE-AC02-76SF00515]
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We investigate the optical conductivity with light polarized along the in-plane orthorhombic a and b axes of Ba(Fe1-xCox)(2)As-2 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. Copyright (C) EPLA, 2011
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