Optical sensing of weak magnetic fields in superconductors using NV centers in diamond

ORAL

Abstract

Visible light fluorescent nitrogen-vacancy centers in diamond have emerged as high sensitivity sensors for nanoscale magnetometry. Here, we study spatial distributions of the magnetic induction upon penetration and expulsion of weak magnetic fields in several representative superconductors. In particular, vector magnetic field was measured with diffraction-limited spatial resolution on the surface of elemental (Pb and Nb), intermetallic (LuNi2B2C), and iron-based (Ba0.6K0.4Fe2As2, Ba(Fe0.93Co0.07)2As2, CaKFe4As4) superconductors in zero-field-cooling (ZFC) and field-cooling (FC) experiments. While ZFC shows robust screening, the structure of the Meissner state after FC ranges from conventional flux expulsion in Pb and LuNi2B2C, to paramagnetic Meissner effect in Nb, to virtually no expulsion in iron-based superconductors. We further apply this technique for accurate measurements of the first critical field and use it to estimate London penetration depth in several superconductors (arXiv:1709.02769).

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Presenters

  • Naufer Nusran

    Ames Lab, Ames Laboratory

Authors

  • Naufer Nusran

    Ames Lab, Ames Laboratory

  • Kamal Joshi

    Ames Lab, Ames Laboratory

  • Kyuil Cho

    Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames Laboratory, Ames Laboratory and Iowa state University

  • Makariy Tanatar

    Ames Laboratory

  • William Meier

    Iowa state university/Ames Laboratory, Iowa State University and Ames Laboratory, Iowa State University/Ames Laboratory, Ames Laboratory and Iowa State University, Dept. of Physics and Astronomy, Dept. of Physics, Iowa State Univ, Ames Laboratory

  • Sergey Bud'ko

    The Ames Laboratory, Iowa state university/Ames Laboratory, Iowa State University and Ames Laboratory, Iowa State University/Ames Laboratory, Iowa State University / Ames Laboratory, Ames Laboratory and Iowa State University, Dept. of Physics and Astronomy, Dept. of Physics, Iowa State Univ, Ames Lab, Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames Laboratory, Department of Physics and Astronomy, Ames Laboratory and Iowa State University

  • Paul Canfield

    Ames Laboratory and Iowa State University, Ames Laboratory, Iowa State University, Department of Physics and Astronomy, Iowa State University, Dept. of Physics and Astronomy, Ames Laboratory/Iowa State University, Iowa state university/Ames Laboratory, Ames Laboratory and Iowa State Univ, Iowa State University and Ames Laboratory, Iowa State University/Ames Laboratory, Iowa State University, Iowa State University / Ames Laboratory, Dept. of Physics, Iowa State Univ, Ames Lab, Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Iowa State Univ, Ames Laboratory, Department of Physics and Astronomy, Ames Laboratory and Iowa State University

  • Yong Liu

    Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames Laboratory

  • T. A. Lograsso

    Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames Laboratory, Ames Laboratory, Iowa State University

  • Ruslan Prozorov

    Ames Lab, Iowa State University and Ames Laboratory, Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames Laboratory, Ames Laboratory and Iowa state University, Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University