Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

11-15-2016

Journal or Book Title

Physical Review B

Volume

94

Issue

19

First Page

195142

DOI

10.1103/PhysRevB.94.195142

Abstract

The detailed optical properties have been determined for the iron-based materials AFe2As2, where A=Ca, Sr, and Ba, for light polarized in the iron-arsenic (a-b) planes over a wide frequency range, above and below the magnetic and structural transitions at TN=138, 195, and 172 K, respectively. The real and imaginary parts of the complex conductivity are fit simultaneously using two Drude terms in combination with a series of oscillators. Above TN, the free-carrier response consists of a weak, narrow Drude term, and a strong, broad Drude term, both of which show only a weak temperature dependence. Below TN there is a slight decrease of the plasma frequency but a dramatic drop in the scattering rate for the narrow Drude term, and for the broad Drude term there is a significant decrease in the plasma frequency, while the decrease in the scattering rate, albeit significant, is not as severe. The small values observed for the scattering rates for the narrow Drude term for T≪TN may be related to the Dirac conelike dispersion of the electronic bands. Below TN new features emerge in the optical conductivity that are associated with the reconstruction Fermi surface and the gapping of bands at Δ1≃45–80 meV, and Δ2≃110–210 meV. The reduction in the spectral weight associated with the free carriers is captured by the gap structure; specifically, the spectral weight from the narrow Drude term appears to be transferred into the low-energy gap feature, while the missing weight from the broad term shifts to the high-energy gap.

Comments

This article is published as Dai, Y. M., Ana Akrap, S. L. Bud'ko, P. C. Canfield, and C. C. Homes. "Optical properties of A Fe 2 As 2 (A= Ca, Sr, and Ba) single crystals." Physical Review B 94, no. 19 (2016): 195142. DOI: 10.1103/PhysRevB.94.195142. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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