Thermoelectric power of Ba(Fe1-xRux)(2)As-2 and Ba(Fe1-xCox)(2)As-2: Possible changes of Fermi surface with and without changes in electron count

TitleThermoelectric power of Ba(Fe1-xRux)(2)As-2 and Ba(Fe1-xCox)(2)As-2: Possible changes of Fermi surface with and without changes in electron count
Publication TypeJournal Article
Year of Publication2011
AuthorsHodovanets H, Mun ED, Thaler A, Bud'ko SL, Canfield PC
Journal TitlePhysical Review B
Volume83
Pages094508
Date Published03
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000288070100008
Keywordshigh-temperature superconductors, state, transition
Abstract

Temperature-dependent, in-plane, thermoelectric power (TEP) data are presented for Ba(Fe1-xRux)(2)As-2 (0 <= x <= 0.36) single crystals. The previously outlined x-T phase diagram for this system is confirmed. The analysis of TEP evolution with Ru doping suggests significant changes in the electronic structure, correlations, and/or scattering occurring near similar to 7%, similar to 30%, and possibly similar to 20% of Ru-doping levels. These results are compared with an extended set of TEP data for the electron-doped Ba(Fe1-xCox)(2)As-2 series for which initial angle-resolved photoemission spectroscopy and transport studies have identified x similar to 0.02 as the concentration at which the Lifshitz transition takes place. In addition to x similar to 0.02 the Co levels of x approximate to 0.11 and 0.22 are identified as concentrations at which similar changes occur.

URL<Go to ISI>://000288070100008
DOI10.1103/PhysRevB.83.094508
Alternate JournalPhys. Rev. B