title: Significant reduction of electronic correlations upon isovalent Ru substitution of BaFe2As2.
abstract: We investigate Ba(Fe0.65Ru0.35)2As2, a compound in which superconductivity appears at the expense of magnetism, by transport measurements and angle resolved photoemission spectroscopy. By resolving the different Fermi surface pockets and deducing from their volumes the number of hole and electron carriers, we show that Ru induces neither hole nor electron doping. However, the Fermi surface pockets are about twice larger than in BaFe2As2. A change of sign of the Hall coefficient with decreasing temperature evidences the contribution of both carriers to the transport. Fermi velocities increase significantly with respect to BaFe2As2, suggesting a reduction of correlation effects.
authors.affiliation: Laboratoire de Physique des Solides, Université Paris Sud, CNRS-UMR8502, 91405 Orsay, France.
authors.forename: V
authors.initials: V
authors.lastname: Brouet
authors.forename: F
authors.initials: F
authors.lastname: Rullier-Albenque
authors.forename: M
authors.initials: M
authors.lastname: Marsi
authors.forename: B
authors.initials: B
authors.lastname: Mansart
authors.forename: M
authors.initials: M
authors.lastname: Aichhorn
authors.forename: S
authors.initials: S
authors.lastname: Biermann
authors.forename: J
authors.initials: J
authors.lastname: Faure
authors.forename: L
authors.initials: L
authors.lastname: Perfetti
authors.forename: A
authors.initials: A
authors.lastname: Taleb-Ibrahimi
authors.forename: P
authors.initials: P
authors.lastname: Le Fèvre
authors.forename: F
authors.initials: F
authors.lastname: Bertran
authors.forename: A
authors.initials: A
authors.lastname: Forget
authors.forename: D
authors.initials: D
authors.lastname: Colson