Vortex flux dynamics and harmonic ac magnetic response of Ba(Fe0.94Ni0.06)2As2 bulk superconductor

Nikolo, Martin; Zapf, Vivien S.; Singleton, John; Jiang, Jianyi; Weiss, Jeremy D.; Hellstrom, Eric E.

doi:10.1007/s10948-016-3618-8

Vortex flux dynamics and harmonic ac magnetic response of Ba(Fe_0.94Ni_0.06)₂As₂ bulk superconductor

Journal Article · Fri Jul 22 00:00:00 EDT 2016 · Journal of Superconductivity and Novel Magnetism

DOI:https://doi.org/10.1007/s10948-016-3618-8· OSTI ID:1345167

Nikolo, Martin ^[1]; ^[2]; ^[2]; Jiang, Jianyi ^[3]; Weiss, Jeremy D. ^[3]; Hellstrom, Eric E. ^[3]

Saint Louis Univ., St. Louis, MO (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Florida State Univ., Tallahassee, FL (United States)

Vortex dynamics and nonlinear ac response are studied in a Ba(Fe_0.94Ni_0.06)₂As₂(T_c= 18.5 K) bulk superconductor in magnetic fields up to 12 T via ac susceptibility measurements of the first ten harmonics. A comprehensive study of the ac magnetic susceptibility and its first ten harmonics finds shifts to higher temperatures with increasing ac measurement frequencies (10 to 10,000 Hz) for a wide range of ac (1, 5, and 10 Oe) and dc fields (0 to 12 T). The characteristic measurement time constant t1 is extracted from the exponential fit of the data and linked to vortex relaxation. The Anderson-Kim Arrhenius law is applied to determine flux activation energy E_a/k as a function dc magnetic field. The de-pinning, or irreversibility lines, were determined by a variety of methods and extensively mapped. The ac response shows surprisingly weak higher harmonic components, suggesting weak nonlinear behavior. Lastly, our data does not support the Fisher model; we do not see an abrupt vortex glass to vortex liquid transition and the resistivity does not drop to zero, although it appears to approach zero exponentially.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: National Science Foundation; USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1345167

Report Number(s):: LA-UR--16-27438

Journal Information:: Journal of Superconductivity and Novel Magnetism, Journal Name: Journal of Superconductivity and Novel Magnetism Journal Issue: 11 Vol. 29; ISSN 1557-1939

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
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Vortex flux dynamics and harmonic ac magnetic response of Ba(Fe0.94Ni0.06)2As2 bulk superconductor

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Vortex flux dynamics and harmonic ac magnetic response of Ba(Fe_0.94Ni_0.06)₂As₂ bulk superconductor