Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

7-13-2012

Journal or Book Title

Physical Review Letters

Volume

109

Issue

2

First Page

027006

DOI

10.1103/PhysRevLett.109.027006

Abstract

We report on infrared studies of charge dynamics in a prototypical pnictide system: the BaFe2As2 family. Our experiments have identified hallmarks of the pseudogap state in the BaFe2As2 system that mirror the spectroscopic manifestations of the pseudogap in the cuprates. The magnitude of the infrared pseudogap is in accord with that of the spin-density-wave gap of the parent compound. By monitoring the superconducting gap of both P- and Co-doped compounds, we find that the infrared pseudogap is unrelated to superconductivity. The appearance of the pseudogap is found to correlate with the evolution of the antiferromagnetic fluctuations associated with the spin-density-wave instability. The strong-coupling analysis of infrared data further reveals the interdependence between the magnetism and the pseudogap in the iron pnictides.

Comments

This article is published as Moon, S. J., A. A. Schafgans, S. Kasahara, T. Shibauchi, T. Terashima, Y. Matsuda, Makariy A. Tanatar et al. "Infrared Measurement of the Pseudogap of P-Doped and Co-Doped High-Temperature BaFe 2 As 2 Superconductors." Physical Review Letters 109, no. 2 (2012): 027006. DOI: 10.1103/PhysRevLett.109.027006. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

Included in

Physics Commons

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