title: Room-temperature ferromagnetism in (Zn1-xMnx)GeP2 semiconductors.
abstract: We report on the discovery of a room-temperature ferromagnetic semiconductor in chalcopyrite (Zn1-xMnx)GeP2 with Tc = 312 K. We have also observed that, at temperatures below 47 K, samples for x = 0.056 and 0.2 show a transition to the antiferromagnetic (AFM) state, so that ferromagnetism is well defined to be present between 47 and 312 K. The observation that the AFM phase is most stable at low temperatures is consistent with the predictions of full-potential linearized augmented plane wave total energy calculations and has consequences for other chalcopyrite materials.
authors.affiliation: Department of Physics, University of Ulsan, Ulsan, 680-749, South Korea. slcho@mail.ulsan.ac.kr
authors.forename: Sunglae
authors.initials: S
authors.lastname: Cho
authors.forename: Sungyoul
authors.initials: S
authors.lastname: Choi
authors.forename: Gi-Beom
authors.initials: GB
authors.lastname: Cha
authors.forename: Soon Cheol
authors.initials: SC
authors.lastname: Hong
authors.forename: Yunki
authors.initials: Y
authors.lastname: Kim
authors.forename: Yu-Jun
authors.initials: YJ
authors.lastname: Zhao
authors.forename: Arthur J
authors.initials: AJ
authors.lastname: Freeman
authors.forename: John B
authors.initials: JB
authors.lastname: Ketterson
authors.forename: B J
authors.initials: BJ
authors.lastname: Kim
authors.forename: Y C
authors.initials: YC
authors.lastname: Kim
authors.forename: Byung-Chun
authors.initials: BC
authors.lastname: Choi