LaFeAsO$_{1-x}$F$_{x}$ thin films: high upper critical fields and evidence of weak link behavior

S. Haindl; M. Kidszun; A. Kauffmann; K. Nenkov; N. Kozlova; J. Freudenberger; T. Thersleff; J. Haenisch; J. Werner; E. Reich; L. Schultz; B. Holzapfel

LaFeAsO$_{1-x}$F$_{x}$ thin films: high upper critical fields and evidence of weak link behavior

Superconductivity 2010-02-18 v2

Authors: S. Haindl , M. Kidszun , A. Kauffmann , K. Nenkov , N. Kozlova , J. Freudenberger , T. Thersleff , J. Haenisch , J. Werner , E. Reich , L. Schultz , B. Holzapfel

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Abstract

High-quality superconducting LaFeAsO $_{1-x}$ F $_{x}$ thin films were grown on single crystalline LaAlO $_{3}$ substrates with critical temperatures (onset) up to 28 K. Resistive measurements in high magnetic fields up to 40 T reveal a paramagnetically limited upper critical field, $\mu_{0}H_{c2}$ (0) around 77 T and a remarkable steep slope of -7.5 T/K near $T_{c}$ . From transport measurements we observed a weak link behavior in low magnetic fields and the evidence for a broad reversible regime.

Keywords

superconducting thin films LaFeAsO$_{1-x}$F$_{x}$ upper critical field weak link behavior paramagnetic limit high magnetic field

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@article{arxiv.0907.2271,
  title  = {LaFeAsO$_{1-x}$F$_{x}$ thin films: high upper critical fields and evidence of weak link behavior},
  author = {S. Haindl and M. Kidszun and A. Kauffmann and K. Nenkov and N. Kozlova and J. Freudenberger and T. Thersleff and J. Haenisch and J. Werner and E. Reich and L. Schultz and B. Holzapfel},
  journal= {arXiv preprint arXiv:0907.2271},
  year   = {2010}
}

Comments

4 pages, 4 figures, Phys. Rev. Lett. (accepted)

LaFeAsO$_{1-x}$F$_{x}$ thin films: high upper critical fields and evidence of weak link behavior

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