title: Lattice distortion and magnetic quantum phase transition in CeFeAs(1-x)P(x)O.
abstract: We use neutron diffraction to study the structural and magnetic phase diagram of CeFeAs(1-x)P(x)O. We find that replacing the larger arsenic with smaller phosphorus in CeFeAs(1-x)P(x)O simultaneously suppresses the AFM order and orthorhombic distortion near x=0.4, thus suggesting the presence of a magnetic quantum critical point. Our detailed structural analysis reveals that the pnictogen height is an important controlling parameter for their electronic and magnetic properties, and may play an important role in electron pairing and superconductivity of these materials.
authors.affiliation: Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA.
authors.forename: Clarina
authors.initials: C
authors.lastname: de la Cruz
authors.forename: W Z
authors.initials: WZ
authors.lastname: Hu
authors.forename: Shiliang
authors.initials: S
authors.lastname: Li
authors.forename: Q
authors.initials: Q
authors.lastname: Huang
authors.forename: J W
authors.initials: JW
authors.lastname: Lynn
authors.forename: M A
authors.initials: MA
authors.lastname: Green
authors.forename: G F
authors.initials: GF
authors.lastname: Chen
authors.forename: N L
authors.initials: NL
authors.lastname: Wang
authors.forename: H A
authors.initials: HA
authors.lastname: Mook
authors.forename: Qimiao
authors.initials: Q
authors.lastname: Si
authors.forename: Pengcheng
authors.initials: P
authors.lastname: Dai