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Title: Measuring the Lower Critical Field of Superconductors Using Nitrogen-Vacancy Centers in Diamond Optical Magnetometry

Journal Article · · Physical Review Applied

The lower critical magnetic eld, Hc1, of superconductors is measured by using ensembles of NV-centers-in-diamond optical magnetometry. The technique is minimally invasive, and has sub- gauss eld sensitivity and submicrometer spatial resolution, which allow for accurate detection of the vector eld at which the vortices start penetrating the sample from the corners. Aided by the revised calculations of the effective demagnetization factors of actual cuboid - shaped samples, Hc1 and the London penetration depth, λ, derived from Hc1 can be obtained. We apply this method to three well-studied superconductors: optimally doped Ba(Fe1-xCox)2As2, stoichiometric CaKFe4As4, and high-Tc cuprate YBa2Cu3O7-δ. Our results are well compared with the values of λ obtained using other techniques, thus adding another non-destructive and sensitive method to measure these important parameters of superconductors.

Research Organization:
Ames Lab., Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1492301
Alternate ID(s):
OSTI ID: 1491228
Report Number(s):
IS-J-9854; PRAHB2
Journal Information:
Physical Review Applied, Vol. 11, Issue 1; ISSN 2331-7019
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Cited By (2)

Measuring magnetic field texture in correlated electron systems under extreme conditions journal December 2019
Nitrogen-vacancy centers in diamond for nanoscale magnetic resonance imaging applications journal January 2019

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