title: Carbon-Induced Ferromagnetism in the Antiferromagnetic Metallic Host Material Mn3ZnN.
abstract: Carbon-for-nitrogen substitution (51 at% at most) was achieved in the antiferromagnetic metallic host material Mn(3)ZnN. The various carbon-doped compounds were studied using synchrotron X-ray diffraction, and their electrical resistivities, specific heats, and degrees of magnetization were measured for temperatures of 2-400 K. The sharp antiferromagnetic-to-paramagnetic transition of the host material at 185 K broadened markedly as the carbon content was increased, and a significant ferromagnetic character was found to coexist with the antiferromagnetism when the carbon concentration exceeded 27 at%. This critical magnetic behavior is likely in part due to the increase in the density of states at the Fermi level and the increase in the distance between neighboring Mn atoms. The exact mechanism responsible for the induction of the complicated magnetic state could not be determined. However, the results demonstrate clearly that the chemical tuning of the X site in antiperovskite Mn(3)AX materials is as useful as that of the A and Mn sites and can be used to develop the properties of these materials for practical applications.
authors.affiliation: International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan. SUN.Ying@nims.go.jp
authors.forename: Ying
authors.initials: Y
authors.lastname: Sun
authors.forename: Yanfeng
authors.initials: Y
authors.lastname: Guo
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Tsujimoto
authors.forename: Jiajia
authors.initials: J
authors.lastname: Yang
authors.forename: Bin
authors.initials: B
authors.lastname: Shen
authors.forename: Wei
authors.initials: W
authors.lastname: Yi
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Matsushita
authors.forename: Cong
authors.initials: C
authors.lastname: Wang
authors.forename: Xia
authors.initials: X
authors.lastname: Wang
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.forename: Clastin I
authors.initials: CI
authors.lastname: Sathish
authors.forename: Kazunari
authors.initials: K
authors.lastname: Yamaura