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Vortex creep and critical current densities in superconducting (Ba,K)Fe2As2 single crystals

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [1];  [2];  [3];  [3];  [4];  [4];  [5]
  1. Ecole Polytechnique, Palaiseau (France)
  2. Ames Laboratory (AMES), Ames, IA (United States)
  3. Chinese Academy of Sciences (CAS), Beijing (China)
  4. Nanjing University (China)
  5. Ames Laboratory, and Iowa State University, Ames, IA (United States)
We report the surprisingly rapid relaxation of the sustainable current density in the critical state of single-crystalline Ba1-xKxFe2As2 is investigated for magnetic fields oriented parallel to the c axis and to the ab plane, respectively. Due to the inadequacy of standard analysis procedures developed for flux creep in the high-temperature superconducting cuprates, we develop a simple, straightforward data treatment technique that reveals the creep mechanism and the creep exponent μ. At low magnetic fields, below the second magnetization peak, μ varies only slightly as a function of temperature and magnetic flux density B. Usin the data, we determine the temperature and field dependencies of the effective activation barrier for creep. At low temperatures, the measured current density approaches the zero-temperature critical current density (in the absence of creep) to within a factor 2, thus lending credence to earlier conclusions drawn with respect to the pinning mechanism. The comparable values of the experimental screening current density and the zero-temperature critical current density reveal the limited usefulness of the widely used “interpolation formula.”
Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
Ecole Polytechnique; French National Research Agency; National Creative Research Initiative; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1052076
Report Number(s):
IS-J--7762
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 2 Vol. 86; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Universality in the current decay and flux creep of Y-Ba-Cu-O high-temperature superconductors journal October 1990
Thermal fluctuations, quenched disorder, phase transitions, and transport in type-II superconductors journal January 1991
Pinning in layered inhomogeneous superconductors journal April 1991
Observation of flux creep through columnar defects inYBa2Cu3O7crystals journal March 1993
Boson localization and correlated pinning of superconducting vortex arrays journal November 1993
Generalized inversion scheme for the determination of activation energies from flux-creep experiments in high-Tcsuperconductors journal November 1993
Magnetization and transport currents in thin superconducting films journal April 1994
Experimental evidence for Bose-glass behavior inBi2Sr2CaCu2O8crystals with columnar defects journal February 1995
Elastic theory of flux lattices in the presence of weak disorder journal July 1995
Interactions and pinning energies in the Bose glass phase of vortices in superconductors journal December 1995
Superconductor disks and cylinders in an axial magnetic field. I. Flux penetration and magnetization curves journal September 1998
Strong pinning in high-temperature superconducting films journal July 2002
Magnetization relaxation and collective vortex pinning in the Fe-based superconductor SmFeAsO 0.9 F 0.1 journal September 2008
Vortex phase diagram of Ba ( Fe 0.93 Co 0.07 ) 2 As 2 single crystals journal December 2008
Flux dynamics and vortex phase diagram in Ba ( Fe 1 − x Co x ) 2 As 2 single crystals revealed by magnetization and its relaxation journal January 2010
Flux pinning in PrFeAsO 0.9 and NdFeAsO 0.9 F 0.1 superconducting crystals journal May 2010
Very strong intrinsic flux pinning and vortex avalanches in ( Ba , K ) Fe 2 As 2 superconducting single crystals journal July 2010
Flux dynamics associated with the second magnetization peak in the iron pnictide Ba 1 − x K x Fe 2 As 2 journal August 2010
Strong pinning and vortex energy distributions in single-crystalline Ba(Fe 1 − x Co x ) 2 As 2 journal September 2011
Quasiparticle Scattering Induced by Charge Doping of Iron-Pnictide Superconductors Probed by Collective Vortex Pinning journal December 2010
Giant Flux Creep and Irreversibility in an Y-Ba-Cu-O Crystal: An Alternative to the Superconducting-Glass Model journal May 1988
Vortex-glass superconductivity: A possible new phase in bulk high- T c oxides journal March 1989
Experimental evidence for vortex-glass superconductivity in Y-Ba-Cu-O journal October 1989
Theory of collective flux creep journal November 1989
Exact solution for flux creep with logarithmic U ( j ) dependence: Self-organized critical state in high- T c superconductors journal August 1991
Boson localization and pinning by correlated disorder in high-temperature superconductors journal April 1992
Flux-creep crossover and relaxation over surface barriers in Bi 2 Sr 2 CaCu 2 O 8 crystals journal August 1992
Elastic theory of pinned flux lattices journal March 1994
Evidence for mean free path fluctuation induced pinning in YBa 2 Cu 3 O 7 and YBa 2 Cu 4 O 8 films journal March 1994
Flux creep in superconducting films: An exact solution journal July 1994
Coulomb Gap and Correlated Vortex Pinning in Superconductors journal June 1995
Local Magnetic Relaxation in High-Temperature Superconductors journal September 1995
Field Induced Vanishing of the Vortex Glass Temperature inTl2Ba2CaCu2O8Thin Films journal August 1997
Magnetization of Hard Superconductors journal March 1962
Transport Properties ofBi2Sr2CaCu2O8Crystals with and without Surface Barriers journal November 1998
Theory of Flux Creep in Hard Superconductors journal October 1962
Hard Superconductivity: Theory of the Motion of Abrikosov Flux Lines journal January 1964
Vortices in high-temperature superconductors journal October 1994

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