Physics – Condensed Matter – Superconductivity
Scientific paper
2008-06-09
Physical Review B, 78, 012507 (2008)
Physics
Condensed Matter
Superconductivity
4 pages, 6 figures, minor corrections and rephrasing
Scientific paper
10.1103/PhysRevB.78.012507
Temperature and magnetic field dependent measurements of the microwave surface impedance of superconducting LaFeAsO$_{0.9}$F$_{0.1}$ (\Tc $\approx$ 26K) reveal a very large upper critical field ($B_{\rm c2} \approx 56$T) and a large value of the depinning frequency ($f_{0}\approx 6$GHz); together with an upper limit for the effective London penetration depth, $\lambda_{\rm eff} \le 200 \rm nm$, our results indicate a strong similarity between this system and the high-$T_{\rm c}$ superconducting cuprates.
Behr Günter
Büchner Bernd
Dulcic A.
Grbic M. S.
Hellmann I.
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