title: Determination of local atomic displacements in CeO(1-x)F(x)BiS2 system.
abstract: We have used Bi and Ce L3-edges extended x-ray absorption fine structure measurements to study local structure of CeO(1-x)F(x)BiS2 system as a function of F-substitution. The local structure of both BiS2 active layer and CeO1-xFx spacer layer changes systematically. The in-plane Bi-S1 distance decreases (ΔRmax ∼ 0.08 Å) and the out-of-plane Bi-S2 distance increases (ΔRmax ∼ 0.12 Å) with increasing F-content. On the other hand, the Ce-O/F distance increases (ΔRmax ∼ 0.2 Å) with a concomitant decrease of the Ce-S2 distance (ΔRmax ∼ 0.15 Å). Interestingly, the Bi-S1 distance is characterized by a large disorder that increases with F-content. The results provide useful information on the local atomic displacements in CeO(1-x)F(x)BiS2, that should be important for the understanding of the coexistence of superconductivity and low temperature ferromagnetism in this system.
authors.affiliation: Dipartimento di Fisica, Università di Roma 'La Sapienza', P. le Aldo Moro 2, 00185 Roma, Italy.
authors.forename: E
authors.initials: E
authors.lastname: Paris
authors.forename: B
authors.initials: B
authors.lastname: Joseph
authors.forename: A
authors.initials: A
authors.lastname: Iadecola
authors.forename: T
authors.initials: T
authors.lastname: Sugimoto
authors.forename: L
authors.initials: L
authors.lastname: Olivi
authors.forename: S
authors.initials: S
authors.lastname: Demura
authors.forename: Y
authors.initials: Y
authors.lastname: Mizuguchi
authors.forename: Y
authors.initials: Y
authors.lastname: Takano
authors.forename: T
authors.initials: T
authors.lastname: Mizokawa
authors.forename: N L
authors.initials: NL
authors.lastname: Saini