"Hysteretic behavior in the optical response of the underdoped Fe-arsenide Ba(Fe1−xCox)2As2 in the electronic nematic phase"

C. Mirri: A. Dusza, S. Bastelberger, J.-H. Chu, H.-H. Kuo, I. R. Fisher, and L. Degiorgi; Physical Review B, 02/07/14.

Additional Authors: A. Dusza, S. Bastelberger, J.-H. Chu, H.-H. Kuo, I. R. Fisher, and L. Degiorgi

Abstract:

We use a new technique that allows in situ variation of uniaxial stress to probe the polarization dependence of the optical reflectivity of the representative underdoped iron-arsenide Ba(Fe1−xCox)2As2 through the tetragonal-to-orthorhombic structural transition and with respect to their electronic nematic phase. These measurements reveal a hysteretic behavior of the anisotropic optical response to uniaxial stress in the orthorhombic state associated with twin boundary motion, whereas the pressure-induced anisotropy of the optical response is reversible in the tetragonal state.