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

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

Abstract

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.

Authors:

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)

Publication Date:: Fri Jul 22 00:00:00 EDT 2016

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

Sponsoring Org.:: National Science Foundation (NSF); USDOE

OSTI Identifier:: 1345167

Report Number(s):: LA-UR-16-27438
Journal ID: ISSN 1557-1939; TRN: US1701769

Grant/Contract Number:: AC52-06NA25396

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Superconductivity and Novel Magnetism

Additional Journal Information:: Journal Volume: 29; Journal Issue: 11; Journal ID: ISSN 1557-1939

Publisher:: Springer

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; high magnetic field science; bulk pnictides; superconductor; AC susceptibility; harmonics; irreversibility lines; activation energy; vortex dynamics; frequency shift; vortex relaxation

Citation Formats


                    Nikolo, Martin, Zapf, Vivien S., Singleton, John, Jiang, Jianyi, Weiss, Jeremy D., and Hellstrom, Eric E. Vortex flux dynamics and harmonic ac magnetic response of Ba(Fe0.94Ni0.06)2As2 bulk superconductor.  United States: N. p., 2016. 
Web.  doi:10.1007/s10948-016-3618-8.

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                    Nikolo, Martin, Zapf, Vivien S., Singleton, John, Jiang, Jianyi, Weiss, Jeremy D., & Hellstrom, Eric E. Vortex flux dynamics and harmonic ac magnetic response of Ba(Fe0.94Ni0.06)2As2 bulk superconductor.  United States.  https://doi.org/10.1007/s10948-016-3618-8

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                    Nikolo, Martin, Zapf, Vivien S., Singleton, John, Jiang, Jianyi, Weiss, Jeremy D., and Hellstrom, Eric E. Fri .  
"Vortex flux dynamics and harmonic ac magnetic response of Ba(Fe0.94Ni0.06)2As2 bulk superconductor".  United States.  https://doi.org/10.1007/s10948-016-3618-8.  https://www.osti.gov/servlets/purl/1345167.

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@article{osti_1345167,

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

  author       = {Nikolo, Martin and Zapf, Vivien S. and Singleton, John and Jiang, Jianyi and Weiss, Jeremy D. and Hellstrom, Eric E.},

  abstractNote = {Vortex dynamics and nonlinear ac response are studied in a Ba(Fe0.94Ni0.06)2As2(Tc= 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 Ea/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.},

  doi          = {10.1007/s10948-016-3618-8},

  journal      = {Journal of Superconductivity and Novel Magnetism},

  number       = 11,

  volume       = 29,

  place        = {United States},

  year         = {Fri Jul 22 00:00:00 EDT 2016},

  month        = {Fri Jul 22 00:00:00 EDT 2016}

}

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Works referenced in this record:

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Similar Records

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

Abstract

Citation Formats

Thermal fluctuations, quenched disorder, phase transitions, and transport in type-II superconductors journal, January 1991

Flux creep and activation energies at the grain boundaries of Y-Ba-Cu-O superconductors journal, April 1989

Inter- and Intra-Granular Flux Pinning Properties in Ba(Fe $$_{0.91}$$ 0.91 Co $$_{0.09})_{2}$$ 0.09 ) 2 As $$_{2}$$ 2 Superconductor in AC and DC Magnetic Fields journal, December 2014

Magneto-transport Properties and Thermally Activated Flux Flow in Ba(Fe 0 . 9 1 Co 0 . 0 9 ) 2 As 2 Superconductor journal, June 2014

Theory of Flux Creep in Hard Superconductors journal, October 1962

Mössbauer studies of the superconducting cobalt/nickel-doped BaFe 2 As 2 . Whither go the injected electron(s)? journal, May 2011

Orientation Dependence of Grain-Boundary Critical Currents in Y Ba 2 Cu 3 O 7 − δ Bicrystals journal, July 1988

Vortex-glass superconductivity: A possible new phase in bulk high- T c oxides journal, March 1989

Mechanochemical synthesis of pnictide compounds and superconducting Ba 0.6 K 0.4 Fe 2 As 2 bulks with high critical current density journal, May 2013

Small anisotropy, weak thermal fluctuations, and high field superconductivity in Co-doped iron pnictide Ba(Fe1−xCox)2As2 journal, February 2009

Anisotropy of the iron pnictide superconductor Ba ( Fe 1 − x Co x ) 2 As 2 ( x = 0.074 , T c = 23 K ) journal, March 2009

Frequency dependence of the ac susceptibility in a Y-Ba-Cu-O crystal: A reinterpretation of H c 2 journal, October 1988

Vortex Dynamics and Irreversibility Line in FeSe0.25Te0.75 journal, January 2015

Magnetotransport Properties, Thermally Activated Flux Flow, and Activation Energies in Ba(Fe0.95 Ni0.05)2As2 and Ba(Fe0.94 Ni0.06)2As2 Superconductors journal, May 2014

Peak effect and superconducting properties of SmFeAsO 0.8 F 0.2 wires journal, September 2008

Superconductivity: A guide to alternating current susceptibility measurements and alternating current susceptometer design journal, January 1995

Comparative high-field magnetotransport of the oxypnictide superconductors R FeAsO 1 − x F x ( R = La , Nd) and SmFeAsO 1 − δ journal, August 2008

Magnetic irreversibility in superconductors characterised by shielding current density journal, December 1994

Superconductivity at 22 K in Co-Doped BaFe 2 As 2 Crystals journal, September 2008

Hard Superconductivity: Theory of the Motion of Abrikosov Flux Lines journal, January 1964

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

Thermal fluctuations, quenched disorder, phase transitions, and transport in type-II superconductors
journal, January 1991

Flux creep and activation energies at the grain boundaries of Y-Ba-Cu-O superconductors
journal, April 1989

Inter- and Intra-Granular Flux Pinning Properties in Ba(Fe $$_{0.91}$$ 0.91 Co $$_{0.09})_{2}$$ 0.09 ) 2 As $$_{2}$$ 2 Superconductor in AC and DC Magnetic Fields
journal, December 2014

Magneto-transport Properties and Thermally Activated Flux Flow in Ba(Fe 0 . 9 1 Co 0 . 0 9 ) 2 As 2 Superconductor
journal, June 2014

Theory of Flux Creep in Hard Superconductors
journal, October 1962

Mössbauer studies of the superconducting cobalt/nickel-doped BaFe ₂ As ₂ . Whither go the injected electron(s)?
journal, May 2011

Orientation Dependence of Grain-Boundary Critical Currents in $Y {Ba}_{2} {Cu}_{3} O_{7 - δ}$ Bicrystals
journal, July 1988

Vortex-glass superconductivity: A possible new phase in bulk high- $T_{c}$ oxides
journal, March 1989

Mechanochemical synthesis of pnictide compounds and superconducting Ba _0.6 K _0.4 Fe ₂ As ₂ bulks with high critical current density
journal, May 2013

Small anisotropy, weak thermal fluctuations, and high field superconductivity in Co-doped iron pnictide Ba(Fe1−xCox)2As2
journal, February 2009

Anisotropy of the iron pnictide superconductor $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$ $(x = 0.074, T_{c} = 23 K)$
journal, March 2009

Frequency dependence of the ac susceptibility in a Y-Ba-Cu-O crystal: A reinterpretation of $H_{c 2}$
journal, October 1988

Vortex Dynamics and Irreversibility Line in FeSe0.25Te0.75
journal, January 2015

Magnetotransport Properties, Thermally Activated Flux Flow, and Activation Energies in Ba(Fe0.95 Ni0.05)2As2 and Ba(Fe0.94 Ni0.06)2As2 Superconductors
journal, May 2014

Peak effect and superconducting properties of SmFeAsO _0.8 F _0.2 wires
journal, September 2008

Superconductivity: A guide to alternating current susceptibility measurements and alternating current susceptometer design
journal, January 1995

Comparative high-field magnetotransport of the oxypnictide superconductors $R {FeAsO}_{1 - x} F_{x}$ ( $R = La$ , Nd) and ${SmFeAsO}_{1 - δ}$
journal, August 2008

Magnetic irreversibility in superconductors characterised by shielding current density
journal, December 1994

Superconductivity at 22 K in Co-Doped ${BaFe}_{2} {As}_{2}$ Crystals
journal, September 2008

Hard Superconductivity: Theory of the Motion of Abrikosov Flux Lines
journal, January 1964