Campbell Penetration Depth in Low Carrier Density Superconductor YPtBi

Author

Hyunsoo Kim, Missouri University of Science and TechnologyFollow
Makariy A. Tanatar
Halyna Hodovanets, Missouri University of Science and TechnologyFollow
Kefeng Wang
Johnpierre Paglione
Ruslan Prozorov

Abstract

Magnetic penetration depth, λ_m, was measured as a function of temperature and magnetic field in single crystals of low carrier density superconductor YPtBi by using a tunnel-diode oscillator technique. Measurements in zero DC magnetic field yield London penetration depth, λ_L(T), but in the applied field the signal includes the Campbell penetration depth, λ_C(T), which is the characteristic length of the attenuation of small excitation field, H_AC, into the Abrikosov vortex lattice due to its elasticity. Whereas the magnetic field dependent λ_C exhibit λ_C ~ B^P with p = 1/2 in most of the conventional and unconventional superconductors, we found that p ≈ 0.23 << 1/2 in YPtBi due to rapid suppression of the pinning strength. From the measured λ_C(T , H), the critical current density is j_c ≈ 40 A/cm² at 75 mK. This is orders of magnitude lower than that of conventional superconductors of comparable T_c.

Recommended Citation

H. Kim et al., "Campbell Penetration Depth in Low Carrier Density Superconductor YPtBi," Physical Review B, vol. 104, no. 1, article no. 14510, American Physical Society (APS), Jul 2021.

The definitive version is available at https://doi.org/10.1103/PhysRevB.104.014510

Department(s)

Physics

Comments

U.S. Department of Energy, Grant GBMF9071

International Standard Serial Number (ISSN)

2469-9969; 2469-9950

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2021 American Physical Society (APS), All rights reserved.

Publication Date

01 Jul 2021