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Title: Spatially-resolved study of the Meissner effect in superconductors using NV-centers-in-diamond optical magnetometry

Non-invasive magnetic field sensing using optically-detected magnetic resonance of nitrogen-vacancy centers in diamond was used to study spatial distribution of the magnetic induction upon penetration and expulsion of weak magnetic fields in several representative superconductors. Vector magnetic fields were measured on the surface of conventional, elemental Pb and Nb, and compound LuNi 2B 2C and unconventional iron-based superconductors Ba 1-xK xFe 2As 2 (x = 0.34 optimal hole doping), Ba(Fe 1-xCo x)2As2 (x = 0.07 optimal electron doping), and stoichiometric CaKFe 4As 4, using variable-temperature confocal system with diffraction-limited spatial resolution. Magnetic induction profiles across the crystal edges were measured in zero-field-cooled and field-cooled conditions. While all superconductors show nearly perfect screening of magnetic fields applied after cooling to temperatures well below the superconducting transition, T c, a range of very different behaviors was observed for Meissner expulsion upon cooling in static magnetic field from above T c. Substantial conventional Meissner expulsion is found in LuNi 2B 2C, paramagnetic Meissner effect is found in Nb, and virtually no expulsion is observed in iron-based superconductors. In all cases, good correlation with macroscopic measurements of total magnetic moment is found.
Authors:
ORCiD logo [1] ;  [1] ; ORCiD logo [1] ; ORCiD logo [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ; ORCiD logo [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics & Astronomy
  2. Ames Lab., Ames, IA (United States)
Publication Date:
Report Number(s):
IS-J-9590
Journal ID: ISSN 1367-2630
Grant/Contract Number:
GBMF4411; AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 20; Journal Issue: 4; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Gordon and Betty Moore Foundation
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1433656

Nusran, N. M., Joshi, K. R., Cho, K., Tanatar, M. A., Meier, W. R., Bud?ko, S. L., Canfield, P. C., Liu, Y., Lograsso, T. A., and Prozorov, R.. Spatially-resolved study of the Meissner effect in superconductors using NV-centers-in-diamond optical magnetometry. United States: N. p., Web. doi:10.1088/1367-2630/aab47c.
Nusran, N. M., Joshi, K. R., Cho, K., Tanatar, M. A., Meier, W. R., Bud?ko, S. L., Canfield, P. C., Liu, Y., Lograsso, T. A., & Prozorov, R.. Spatially-resolved study of the Meissner effect in superconductors using NV-centers-in-diamond optical magnetometry. United States. doi:10.1088/1367-2630/aab47c.
Nusran, N. M., Joshi, K. R., Cho, K., Tanatar, M. A., Meier, W. R., Bud?ko, S. L., Canfield, P. C., Liu, Y., Lograsso, T. A., and Prozorov, R.. 2018. "Spatially-resolved study of the Meissner effect in superconductors using NV-centers-in-diamond optical magnetometry". United States. doi:10.1088/1367-2630/aab47c. https://www.osti.gov/servlets/purl/1433656.
@article{osti_1433656,
title = {Spatially-resolved study of the Meissner effect in superconductors using NV-centers-in-diamond optical magnetometry},
author = {Nusran, N. M. and Joshi, K. R. and Cho, K. and Tanatar, M. A. and Meier, W. R. and Bud?ko, S. L. and Canfield, P. C. and Liu, Y. and Lograsso, T. A. and Prozorov, R.},
abstractNote = {Non-invasive magnetic field sensing using optically-detected magnetic resonance of nitrogen-vacancy centers in diamond was used to study spatial distribution of the magnetic induction upon penetration and expulsion of weak magnetic fields in several representative superconductors. Vector magnetic fields were measured on the surface of conventional, elemental Pb and Nb, and compound LuNi2B2C and unconventional iron-based superconductors Ba1-xKxFe2As2 (x = 0.34 optimal hole doping), Ba(Fe1-xCox)2As2 (x = 0.07 optimal electron doping), and stoichiometric CaKFe4As4, using variable-temperature confocal system with diffraction-limited spatial resolution. Magnetic induction profiles across the crystal edges were measured in zero-field-cooled and field-cooled conditions. While all superconductors show nearly perfect screening of magnetic fields applied after cooling to temperatures well below the superconducting transition, Tc, a range of very different behaviors was observed for Meissner expulsion upon cooling in static magnetic field from above Tc. Substantial conventional Meissner expulsion is found in LuNi2B2C, paramagnetic Meissner effect is found in Nb, and virtually no expulsion is observed in iron-based superconductors. In all cases, good correlation with macroscopic measurements of total magnetic moment is found.},
doi = {10.1088/1367-2630/aab47c},
journal = {New Journal of Physics},
number = 4,
volume = 20,
place = {United States},
year = {2018},
month = {4}
}