Near Ferromagnetism in MnP-Type CoAs

ORAL

Abstract

We report the low temperature electrical and magnetic properties of single crystal CoAs. This material is isostructural with compounds like MnP, CrAs, and FeAs, which show intriguing superconducting and magnetic states as a function of temperature, magnetic field, and applied pressure. While there is no experimental evidence for magnetic ordering in CoAs, we have performed density functional theory calculations that favor a ferromagnetic ground state. Additionally, heat capacity and magnetization measurements suggest a ferromagnetic instability at low temperatures. De Haas-van Alphen oscillations observed at high fields support the calculated paramagnetic Fermi surface and give a measure of correlation strength. This talk will review the properties of CoAs in the light of other similar transition metal-pnictide binary materials.

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Presenters

  • Daniel Campbell

    CNAM, Department of Physics, University of Maryland, CNAM, Department of Physics, Univ of Maryland-College Park, Univ of Maryland-College Park

Authors

  • Daniel Campbell

    CNAM, Department of Physics, University of Maryland, CNAM, Department of Physics, Univ of Maryland-College Park, Univ of Maryland-College Park

  • Limin Wang

    CNAM, Department of Physics, Univ of Maryland-College Park, Univ of Maryland-College Park, Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, CNAM, Physics Department, University of Maryland

  • Chris Eckberg

    CNAM, Department of Physics, University of Maryland, Univ of Maryland-College Park, Department of Physics, University of Maryland

  • David Graf

    NHMFL Tallahassee, NHMFL, National High Magnetic Field Lab, National High Magnetic Field Laboratory, National High Magnetic Field Laboratory/Florida State University, Natl High Magnetic Field Lab, NHMFL at Florida State University, Florida State University, National High Magnetic Field Laboratory, Florida State University, Condensed Matter Science, NHMFL

  • Halyna Hodovanets

    Ames Laboratory, Iowa State University, CNAM, Department of Physics, University of Maryland, Univ of Maryland-College Park

  • Johnpierre Paglione

    Center for Nanophysics and Advanced Materials , University of Maryland, CNAM, Department of Physics, University of Maryland, Univ of Maryland-College Park, Department of Physics, University of Maryland, CNAM, Department of Physics, Univ of Maryland-College Park, Univ of Maryland - College Park, College Park, MD 20742-4111, Univ of Maryland-College Park, Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, Center for Nanophysics and Advanced Materials, University of Maryland, University of Maryland, College Park, University of Maryland