Strong magnetic field dependence of critical current densities and vortex activation energies in an anisotropic clean MgB2 thin film

Kim, Jeehoon; Haberkorn, N.; Nazaretski, Evgeny; Paula, R. de; Tan, Teng; Xi, X. X.; Tajima, T.; Movshovich, R.; Civale, L.

doi:10.1016/j.ssc.2014.11.015

Strong magnetic field dependence of critical current densities and vortex activation energies in an anisotropic clean MgB₂ thin film

Journal Article · Tue Nov 25 00:00:00 EST 2014 · Solid State Communications

DOI:https://doi.org/10.1016/j.ssc.2014.11.015· OSTI ID:2560726

Kim, Jeehoon ^[1]; Haberkorn, N. ^[2]; ^[3]; Paula, R. de ^[4]; Tan, Teng ^[5]; Xi, X. X. ^[5]; Tajima, T. ^[4]; Movshovich, R. ^[4]; Civale, L. ^[4]

Institute for Basic Science (IBS), Pohang (Korea, Republic of); Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of)
Centro Atómico Bariloche (Argentina)
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Temple Univ., Philadelphia, PA (United States)

Here we report the influence of two-band superconductivity on the flux creep and the critical current densities of a MgB₂ thin film. The small magnetic penetration depth of λ=50±10 nm at T=4K is related to a clean π-band. We find a high self-field critical current density J_c, which is strongly reduced with applied magnetic field, and attribute this to suppression of the superconductivity in the π-band. The temperature dependence of the creep rate S (T) at low magnetic field can be explained by a simple Anderson–Kim mechanism. The system shows high pinning energies at low field that are strongly suppressed by high field.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: SC0004410; SC0012704

OSTI ID:: 2560726

Alternate ID(s):: OSTI ID: 1229372
OSTI ID: 1245228

Report Number(s):: BNL--228040-2025-JAAM

Journal Information:: Solid State Communications, Journal Name: Solid State Communications Vol. 204; ISSN 0038-1098

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Strong magnetic field dependence of critical current densities and vortex activation energies in an anisotropic clean MgB2 thin film

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