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Anomalous Meissner effect in pnictide superconductors

R. Prozorov, M. A. Tanatar, Bing Shen, Peng Cheng, Hai-Hu Wen, S. L. Bud’ko, and P. C. Canfield
Phys. Rev. B 82, 180513(R) – Published 18 November 2010
Physics logo See Synopsis: Outstanding in the field

Abstract

The Meissner effect has been studied in Ba(Fe0.926Co0.074)2As2 and Ba0.6K0.4Fe2As2 single crystals and compared to well known, type-II superconductors LuNi2B2C and V3Si. Whereas flux penetration is mostly determined by the bulk pinning (and, perhaps, surface barrier) resulting in a large negative magnetization, the flux expulsion upon cooling in a magnetic field is very small, which could also be due to pinning and/or surface-barrier effects. However, in stark contrast with the expected behavior, the amount of the expelled flux increases almost linearly with the applied magnetic field, at least up to our maximum field of 5.5 T, which far exceeds the upper limit for the surface barrier. One interpretation of the observed behavior is that there is a field-driven suppression of magnetic pair breaking.

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  • Received 22 October 2010

DOI:https://doi.org/10.1103/PhysRevB.82.180513

©2010 American Physical Society

Synopsis

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Outstanding in the field

Published 19 November 2010

Iron arsenide superconductors exhibit a surprising capacity to prevent magnetic field penetration.

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Authors & Affiliations

R. Prozorov1,*, M. A. Tanatar1, Bing Shen2, Peng Cheng2, Hai-Hu Wen2, S. L. Bud’ko1, and P. C. Canfield1

  • 1The Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, Iowa 50011, USA
  • 2Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

  • *Corresponding author; prozorov@ameslab.gov

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Issue

Vol. 82, Iss. 18 — 1 November 2010

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