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      Direct Observation of Localized Spin Antiferromagnetic Transition in PdCrO 2 by Angle-Resolved Photoemission Spectroscopy

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          Abstract

          We report the first case of the successful measurements of a localized spin antiferromagnetic transition in delafossite-type PdCrO 2 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 PdCrO 2 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.

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          Unfolding first-principles band structures

          Chi-Cheng Lee, Wei Ku, Tom Berlijn (2010)
          A general method is presented to unfold band structures of first-principles super-cell calculations with proper spectral weight, allowing easier visualization of the electronic structure and the degree of broken translational symmetry. The resulting unfolded band structures contain additional rich information from the Kohn-Sham orbitals, and absorb the structure factor that makes them ideal for a direct comparison with angular resolved photoemission spectroscopy experiments. With negligible computational expense via the use of Wannier functions, this simple method has great practical value in the studies of a wide range of materials containing impurities, vacancies, lattice distortions, or spontaneous long-range orders.
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            Anisotropic electric conductivity of delafossite PdCoO2 studied by angle-resolved photoemission spectroscopy.

            En-hi Cho, Hyeong-Jun Kim, Han-Sung Kim … (2009)
            An explicit connection between the electronic structure and the anisotropic high conductivity of delafossite-type PdCoO2 has been established by angle-resolved photoemission spectroscopy (ARPES) and core-level x-ray photoemission spectroscopy. The ARPES spectra show that a large hexagonal electronlike Fermi surface (FS) consists of very dispersive Pd 4d states. The carrier velocity and lifetime are determined from the ARPES data, and the conductivity is calculated by a solution of the Boltzmann equation, which demonstrates that the high anisotropic conductivity originates from the high carrier velocity, the large two-dimensional FS, and the long lifetime of the carriers.
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              Electronic-structure-driven magnetic and structure transitions in superconducting NaFeAs single crystals measured by angle-resolved photoemission spectroscopy.

              Ji C. He, Makoto Shimada, Chun-Yan Zhang … (2010)
              The electronic structure of NaFeAs is studied with angle-resolved photoemission spectroscopy on high quality single crystals. Large portions of the band structure start to shift around the structural transition temperature and smoothly evolve as the temperature lowers through the spin density wave transition. Moreover, band folding due to magnetic order emerges slightly above the structural transition. Our observation provides direct evidence that the structural and magnetic transitions share the same origin and could both be driven by the electronic structure reconstruction in Fe-based superconductors instead of Fermi surface nesting. We did not observe any sign of a gap in the superconducting state, which is likely related to weakened superconductivity in the presence of the spin density wave.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Sci Rep
                Journal ID (iso-abbrev): Sci Rep
                Title: Scientific Reports
                Publisher: Nature Publishing Group
                ISSN (Electronic): 2045-2322
                Publication date (Electronic): 14 January 2014
                Publication date Collection: 2014
                Volume: 4
                Electronic Location Identifier: 3680
                Affiliations
                [1 ]Department of Physics, Chonnam National University , Gwangju 500-757, Korea
                [2 ]Department of Physics, Pohang University of Science and Technology , Pohang 790-784, Korea
                [3 ]Pohang Accelerator Laboratory, Pohang University of Science and Technology , Pohang 790-784, Korea
                [4 ]Korea Atomic Energy Research Institute , Daejeon, 305-353, Korea
                [5 ]Current address: Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-747, Korea.
                Author notes
                Article
                Publisher Item ID: srep03680
                DOI: 10.1038/srep03680
                PMC ID: 3890906
                PubMed ID: 24419488
                SO-VID: 79a7bba9-d28b-4458-8752-794d7cc4b8c1
                Copyright © Copyright © 2014, Macmillan Publishers Limited. All rights reserved
                License:

                This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/

                History
                Date received : 29 August 2013
                Date accepted : 17 December 2013
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                Subject: Article

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