Infrared measurement of the pseudogap of P-doped and Co-doped high-temperature BaFe 2As 2 superconductors

S. J. Moon, A. A. Schafgans, S. Kasahara, T. Shibauchi, T. Terashima, Y. Matsuda, M. A. Tanatar, R. Prozorov, A. Thaler, P. C. Canfield, A. S. Sefat, D. Mandrus, D. N. Basov

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55 Citations (Scopus)

Abstract

We report on infrared studies of charge dynamics in a prototypical pnictide system: the BaFe 2As 2 family. Our experiments have identified hallmarks of the pseudogap state in the BaFe 2As 2 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.

Original languageEnglish
Article number027006
JournalPhysical Review Letters
Volume109
Issue number2
DOIs
Publication statusPublished - Jul 13 2012
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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