Infrared Measurement of the Pseudogap of P-Doped and Co-Doped High-Temperature BaFe2As2 Superconductors

TitleInfrared Measurement of the Pseudogap of P-Doped and Co-Doped High-Temperature BaFe2As2 Superconductors
Publication TypeJournal Article
Year of Publication2012
AuthorsMoon SJ, Schafgans AA, Kasahara S, Shibauchi T, Terashima T, Matsuda Y, Tanatar MA, Prozorov R, Thaler A, Canfield PC, Sefat AS, Mandrus D, Basov DN
Journal TitlePhysical Review Letters
Volume109
Pages027006
Date Published07
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberWOS:000306417200015
Keywordsanisotropy, electrodynamics, electronic nematicity, metal, phase, pnictides, symmetry, transition
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.

URL<Go to ISI>://WOS:000306417200015
DOI10.1103/PhysRevLett.109.027006
Alternate JournalPhys. Rev. Lett.