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Title: Local characterization of a heavy-fermion superconductor via sub-Kelvin magnetic force microscopy

Abstract

Using magnetic force microscopy operating at sub-Kelvin temperatures, we characterize the heavy fermion superconductor CeCoIn5. We pinpoint the absolute London penetration depth of λ(0)=435 ± 20 nm and report its temperature dependence, which is closely linked to the symmetry of the superconducting gap. In addition, we directly measure the pinning force of individual Abrikosov vortices and estimate the critical current density of jc=9×104 A/cm2. In contrast to the related, well-established tunnel diode oscillator technique, our method is capable of resolving inhomogeneities locally on the micrometer scale at ultra-low temperature.

Authors:
ORCiD logo; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1737702
Grant/Contract Number:  
Basic Energy Sciences; Division of Materials Sciences; Engineering
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Name: Applied Physics Letters Journal Volume: 117 Journal Issue: 25; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics
Country of Publication:
United States
Language:
English

Citation Formats

Wulferding, Dirk, Kim, Geunyong, Kim, Hoon, Yang, Ilkyu, Bauer, E. D., Ronning, F., Movshovich, R., and Kim, Jeehoon. Local characterization of a heavy-fermion superconductor via sub-Kelvin magnetic force microscopy. United States: N. p., 2020. Web. doi:10.1063/5.0028517.
Wulferding, Dirk, Kim, Geunyong, Kim, Hoon, Yang, Ilkyu, Bauer, E. D., Ronning, F., Movshovich, R., & Kim, Jeehoon. Local characterization of a heavy-fermion superconductor via sub-Kelvin magnetic force microscopy. United States. https://doi.org/10.1063/5.0028517
Wulferding, Dirk, Kim, Geunyong, Kim, Hoon, Yang, Ilkyu, Bauer, E. D., Ronning, F., Movshovich, R., and Kim, Jeehoon. Mon . "Local characterization of a heavy-fermion superconductor via sub-Kelvin magnetic force microscopy". United States. https://doi.org/10.1063/5.0028517.
@article{osti_1737702,
title = {Local characterization of a heavy-fermion superconductor via sub-Kelvin magnetic force microscopy},
author = {Wulferding, Dirk and Kim, Geunyong and Kim, Hoon and Yang, Ilkyu and Bauer, E. D. and Ronning, F. and Movshovich, R. and Kim, Jeehoon},
abstractNote = {Using magnetic force microscopy operating at sub-Kelvin temperatures, we characterize the heavy fermion superconductor CeCoIn5. We pinpoint the absolute London penetration depth of λ(0)=435 ± 20 nm and report its temperature dependence, which is closely linked to the symmetry of the superconducting gap. In addition, we directly measure the pinning force of individual Abrikosov vortices and estimate the critical current density of jc=9×104 A/cm2. In contrast to the related, well-established tunnel diode oscillator technique, our method is capable of resolving inhomogeneities locally on the micrometer scale at ultra-low temperature.},
doi = {10.1063/5.0028517},
journal = {Applied Physics Letters},
number = 25,
volume = 117,
place = {United States},
year = {2020},
month = {12}
}

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