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Infrared pseudogap in cuprate and pnictide high-temperature superconductors

TitleInfrared pseudogap in cuprate and pnictide high-temperature superconductors
Publication TypeJournal Article
Year of Publication2014
AuthorsMoon, SJ, Lee, YS, Schafgans, AA, Chubukov, AV, Kasahara, S, Shibauchi, T, Terashima, T, Matsuda, Y, Tanatar, MA, Prozorov, R, Thaler, A, Canfield, PC, Bud'ko, SL, Sefat, AS, Mandrus, D, Segawa, K, Ando, Y, Basov, DN
JournalPhysical Review B
Date Published07
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000339122200003
Keywordsaxis response, charge dynamics, conductivity, cuo2 planes, density-wave order, detwinned ba(fe1-xcox)(2)as-2, dynamics, electronic nematicity, high-t-c, iron pnictides, optical, spin

cattering rate below 700-900 cm(-1). The latter result allows us to identify the energy scale associated with the pseudogap Delta PG. We find that in the Ba122-based materials the superconductivity-induced changes of the infrared spectra occur in the frequency region below 100-200 cm(-1), which is much lower than the energy scale of the pseudogap. We performed theoretical analysis of the scattering rate data of the two compounds using the same model, which accounts for the effects of the pseudogap and electron-boson coupling. We find that the scattering rate suppression in Ba122-based compounds below Delta PG is solely due to the pseudogap formation, whereas the impact of the electron-boson coupling effects is limited to lower frequencies. The magnetic resonance modes used as inputs in our modeling are found to evolve with the development of the pseudogap, suggesting an intimate correlation between the pseudogap and magnetism.

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