Publication Date:
2018-04-13
Description:
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 2 B 2 C and unconventional iron-based superconductors Ba 1− x K x Fe 2 As 2 ( x = 0.34 optimal hole doping), Ba(Fe 1− x Co x ) 2 As 2 ( x = 0.07 optimal electron doping), and stoichiometric CaKFe 4 As 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...
Electronic ISSN:
1367-2630
Topics:
Physics
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