Abstract
Thermally assisted flux flow (TAFF) is studied in bulk Ba(Fe0.95 Ni0.05)2As2 (T c = 20.4 K) and Ba(Fe0.94 Ni0.06)2As2 (T c = 18.5 K) superconductors by transport measurements in magnetic fields up to 18 T. In addition, the upper critical field μ 0 H c2(0) and the coherence length ξ(0) are determined. The data is analyzed in the context of the widely accepted Anderson-Kim model and Fischer model. The onset TAFF temperature and the crossover temperature T x from TAFF to flux flow are determined. The flux pinning activation energy U is modeled as U(T,H) = U 0(H) f(t) where f(t) is some temperature function and the modified Anderson-Kim model is used to extract U 0, which is graphed as a function of magnetic field μ 0 H near T c. The resistive regime is observed, which is caused by fluctuations. Fisher’s model is applied to determine the glass melting transition temperature; it occurs in the upper TAFF state and not in the expected zero-resistivity vortex solid regime. Furthermore, the resistive transition width is proportional to μ 0 H, in contrast to Tinkham’s prediction. The H-T phase diagram is drawn.
Similar content being viewed by others
References
Tanatar, M.A., et al.: Phys. Rev. B 79, 094507 (2009)
Jaroszynski, J., et al.: Phys. Rev. B 78, 064511 (2008)
Chen, Y.L., et al.: Supercond. Sci. Technol. 21, 115014 (2008)
Khasanov, A., et al.: J. Phys. -Condens. Mat. 23, 202201 (2011)
Celentano, G., et al.: IEEE Trans. Appl. Supercond. 4(3) (2011)
Sefat, A.S., et al.: Phys. Rev. Lett. 101, 117004 (2008)
Rotter, M., et al.: Phys. Rev. B 78, 020503(R) (2008)
Yamamoto, A., et al.: Appl. Phys. Lett. 94, 062511 (2009)
Wang, M., et al.: Phys. Rev. B 81, 174524 (2010)
Chi, S., et al.: Phys. Rev. Lett. 102, 107006 (2009)
Li, S., et al.: Phys. Rev. B 79, 174527 (2009)
Werthamer, N.R., et al.: Phys. Rev. 147, 295 (1966)
Tinkham, M.: Introduction to Superconductivity, 2nd edn. p. 135. McGraw-Hill, New York (1996)
Gasparov, V.A., et al.: JETP Lett. 93, 667–672 (2011)
Gasparov, V.A., et al.: JETP Lett. 93, 746 (2011)
Sun, D.L., et al.: Phys. Rev. B 80, 144515 (2009)
Tinkham, M.: Phys. Rev. Lett. 61, 1659 (1988)
Anderson, P.W.: Phys. Rev. Lett. 9, 309 (1962)
Anderson, P.W., Kim, Y.B.: Rev. Mod. Phys. 36, 39 (1964)
Brandt, E.H.: Physica B 169, 91–98 (1991)
Fisher, M.P.A.: Phys. Rev. Lett. 62, 1415 (1989)
Koch, R.H., et al.: Phys. Rev. Lett. 63, 1511 (1989)
Fisher, D.S., et al.: Phys. Rev. B 43, 130 (1991)
Patnaik, S., et al.: Phys. Rev. B 70, 064503 (2003)
Batlogg, B., et al.: Flux dynamics and electronic anisotropy in high-temperature superconductor. In: Fukuyama, H., et al. (eds.) Strong Correlation and Superconductivity, vol. 89. Springer Series in Physics, Berlin (1989)
Nikolo, M., et al.: Magneto-transport properties and thermally activated flux flow in Ba(Fe0.91Co0.09)2As2 superconductor, to be published in 2014
Resnick, D.J., et al.: Phys. Rev. Lett. 47, 1542 (1981)
Abraham, D.W., et al.: Phys. Rev. 26, 5268 (1982)
de Gennes, P.G.: Rev. Mod. Phys. 36, 225 (1964)
Woo, K.C., et al.: Phys. Rev. Lett. 63, 1877 (1989)
Shi, D., et al.: Supercond. Sci. Tech. 3, 289 (1990)
Palstra, T.T.M.: Phys. Rev. Lett. 61, 1662 (1988)
Patnaik, S., et al.: Phys. Rev. B 70, 064503 (2004)
Kim, D.H., et al.: Phys. Rev. B 42, 6249 (1990)
Malozemoff, A.P., et al.: Flux creep and the crossover to flux flow in the resistivity of high temperature superconductors. In: Fukuyama, H., et al. (eds.) Strong Correlations and Superconductivity, vol. 89. Springer Series in Physics, Berlin (1989)
Zeldov, et al.: Phys. Rev. Lett. 65, 278 (1990)
Ferrari, M.J., et al.: Phys. Rev. Lett. 64, 72 (1990)
Inosov, D.S., et al.: Phys. Rev. B 81, 014513 (2010)
Prozorov, R., et al.: Phys. Rev. B 78, 224506 (2008)
Shen, B., et al.: Phys. Rev. B 81, 014503 (2010)
Acknowledgments
This work at The National High Magnetic Field Laboratory was supported by NSF DMR-1006584 and DMR-1306785, the State of Florida, and by NHMFL which is supported by the National Science Foundation under DMR-1157490.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Nikolo, M., Shi, X., Jiang, J. et al. Magnetotransport Properties, Thermally Activated Flux Flow, and Activation Energies in Ba(Fe0.95 Ni0.05)2As2 and Ba(Fe0.94 Ni0.06)2As2 Superconductors. J Supercond Nov Magn 27, 1983–1990 (2014). https://doi.org/10.1007/s10948-014-2550-z
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10948-014-2550-z