Using NV-centers in diamond for optical magnetic sensing in superconductors

ORAL

Abstract

Magnetic field--dependent fluorescence of nitrogen vacancy (NV) centers in diamond has recently emerged as a promising technology for nanoscale sensing including non-invasive sensitive magnetometry and mapping of the magnetic field distribution. In particular, NV-sensing can be used to study magnetic phenomena in superconductors. After detailed introduction of this novel magneto-sensing technique, we will present results of magnetic measurements on several superconductors, including Ba$_{\mathrm{1-x}}$K$_{\mathrm{x}}$Fe$_{\mathrm{2}}$As$_{\mathrm{2}}$ and type-I materials. Details of the superconducting phase transition, the Meissner state, magnetic flux distribution upon field penetration, exit and trapping will be discussed.

*This work was supported by the U.S. Department of Energy, Office of Basic Energy Science, Materials Science and Engineering Division and was performed at the Ames Laboratory, Iowa State University under contract DE-AC02-07CH11358.

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Authors

  • N M Nusran

    • Ames Laboratory and Iowa State University

  • K R Joshi

    • Ames Laboratory and Iowa State University

  • K Cho

    • Ames Laboratory and Iowa State University, USA
    • Ames Laboratory and Iowa State University

  • R Prozorov

    • The Ames Laboratory and Iowa State University
    • Ames Laboratory and Iowa State University, USA
    • Ames Laboratory and Iowa State University