title: Mn K-edge XMCD in Mn3MC (M=Zn and Ga) perovskite.
abstract: Mn3MC (M=Zn and Ga) perovskite has attracted interest because of a variety of magnetic phase transitions. In this work, we measure temperature and magnetic field dependence of X-ray magnetic circular dichroism (XMCD) at Mn K-edge and discuss effect of second constituent metal on the magnetic states of Mn atoms. The spectrum in Mn3ZnC is characterized by a dispersion-type profile. In Mn3GaC, intensity of the positive peak at the edge is drastically reduced. The difference originates in charge transfer from Zn or Ga to Mn atoms. Temperature and magnetic field variations of the Mn K-edge XMCD spectrum suggest that orbital magnetic moments are closely related to the magnetic phase transition.
authors.affiliation: Department of Physics, Faculty of Science, Okayama Univ., Japan. uemoto@mag.okayama-u.ac.jp
authors.forename: S
authors.initials: S
authors.lastname: Uemoto
authors.forename: H
authors.initials: H
authors.lastname: Maruyama
authors.forename: N
authors.initials: N
authors.lastname: Kawamura
authors.forename: S
authors.initials: S
authors.lastname: Uemura
authors.forename: N
authors.initials: N
authors.lastname: Kitamoto
authors.forename: H
authors.initials: H
authors.lastname: Nakao
authors.forename: S
authors.initials: S
authors.lastname: Hara
authors.forename: M
authors.initials: M
authors.lastname: Suzuki
authors.forename: D
authors.initials: D
authors.lastname: Fruchart
authors.forename: H
authors.initials: H
authors.lastname: Yamazaki