title: Direct observation of localized spin antiferromagnetic transition in PdCrO2 by angle-resolved photoemission spectroscopy.
abstract: We report the first case of the successful measurements of a localized spin antiferromagnetic transition in delafossite-type PdCrO2 by angle-resolved photoemission spectroscopy (ARPES). This demonstrates how to circumvent the shortcomings of ARPES for investigation of magnetism involved with localized spins in limited size of two-dimensional crystals or multi-layer thin films that neutron scattering can hardly study due to lack of bulk compared to surface. Also, our observations give direct evidence for the spin ordering pattern of Cr(3+) ions in PdCrO2 suggested by neutron diffraction and quantum oscillation measurements, and provide a strong constraint that has to be satisfied by a microscopic mechanism for the unconventional anomalous Hall effect recently reported in this system.
authors.affiliation: Department of Physics, Chonnam National University, Gwangju 500-757, Korea.
authors.forename: Han-Jin
authors.initials: HJ
authors.lastname: Noh
authors.affiliation: Department of Physics, Chonnam National University, Gwangju 500-757, Korea.
authors.forename: Jinwon
authors.initials: J
authors.lastname: Jeong
authors.affiliation: Department of Physics, Chonnam National University, Gwangju 500-757, Korea.
authors.forename: Bin
authors.initials: B
authors.lastname: Chang
authors.affiliation: Department of Physics, Chonnam National University, Gwangju 500-757, Korea.
authors.forename: Dahee
authors.initials: D
authors.lastname: Jeong
authors.affiliation: Department of Physics, Chonnam National University, Gwangju 500-757, Korea.
authors.forename: Hyun Sook
authors.initials: HS
authors.lastname: Moon
authors.affiliation: Department of Physics, Chonnam National University, Gwangju 500-757, Korea.
authors.forename: En-Jin
authors.initials: EJ
authors.lastname: Cho
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: Jong Mok
authors.initials: JM
authors.lastname: Ok
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: Jun Sung
authors.initials: JS
authors.lastname: Kim
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: Kyoo
authors.initials: K
authors.lastname: Kim
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: B I
authors.initials: BI
authors.lastname: Min
authors.affiliation: Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: Han-Koo
authors.initials: HK
authors.lastname: Lee
authors.affiliation: Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: Jae-Young
authors.initials: JY
authors.lastname: Kim
authors.affiliation: Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: Byeong-Gyu
authors.initials: BG
authors.lastname: Park
authors.affiliation: 1] Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 790-784, Korea [2].
authors.forename: Hyeong-Do
authors.initials: HD
authors.lastname: Kim
authors.affiliation: Korea Atomic Energy Research Institute, Daejeon, 305-353, Korea.
authors.forename: Seongsu
authors.initials: S
authors.lastname: Lee