Muon-spin-relaxation measurements of magnetic penetration depth in organic superconductors (BEDT-TTF<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>-<i>X</i>:<i>X</i>=Cu(NCS<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and Cu[N(CN<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>]Br
L. P. Le(Columbia University), G. M. Luke(Columbia University), B. J. Sternlieb(Columbia University), W. D. Wu(Columbia University), Yohei Uemura(Columbia University), J. H. Brewer(Columbia University), T. M. Riseman(University of British Columbia), C. E. Stronach(Virginia State University), G. Saito(Columbia University), Hideki Yamochi(Kyoto University), H. H. Wang(Argonne National Laboratory), A. M. Kini(Argonne National Laboratory), K. Douglas Carlson(Columbia University), Jack M. Williams(Columbia University)
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Abstract
The magnetic-field penetration depth \ensuremath{\lambda} in the organic superconductors \ensuremath{\kappa}-(BEDT-TTF${)}_{2}$ Cu(NCS${)}_{2}$ and \ensuremath{\kappa}-(BEDT-TTF${)}_{2}$ Cu[N(CN${)}_{2}$]Br has been measured over a wide temperature region 20 mK\ensuremath{\le}T\ensuremath{\le}15 K via the muon-spin-relaxation technique. Linear variation of \ensuremath{\lambda} with T at low temperatures, found in both systems, is consistent with anisotropic superconducting pairings with line nodes in the energy gap. In the latter compound, we observe flux depinning at T\ensuremath{\sim}5 K, well below ${\mathit{T}}_{\mathit{c}}$=12 K.
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