Interplane penetration depth and coherent transport in organic superconductors

Measurements of the interlayer penetration depth {lambda}{sub {perpendicular}} have been performed on single crystals of the organic superconductors {kappa}-(ET){sub 2}Cu[N(CN){sub 2}]Br and {kappa}-(ET){sub 2}Cu(NCS){sub 2}. We find that {lambda}{sub {perpendicular}}(0){approx}130 {micro}m for both...

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Veröffentlicht in:Phys. Rev. B 2009-08, Vol.80 (5), Article 054519
Hauptverfasser: Olheiser, Tyson A., Shi, Zane, Lawrie, David D., Giannetta, Russell W., Schlueter, John A.
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Sprache:eng
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Zusammenfassung:Measurements of the interlayer penetration depth {lambda}{sub {perpendicular}} have been performed on single crystals of the organic superconductors {kappa}-(ET){sub 2}Cu[N(CN){sub 2}]Br and {kappa}-(ET){sub 2}Cu(NCS){sub 2}. We find that {lambda}{sub {perpendicular}}(0){approx}130 {micro}m for both materials. The normalized superfluid density {rho}{sub {perpendicular}} = [{lambda}{sub {perpendicular}}(0)/{lambda}{sub {perpendicular}} (T)]{sup 2} may be fit equally well to a power law 1{rho}{sub {perpendicular}} {approx} T{sup n} with n = 1.3-1.5 or to the form 1{rho}{sub {perpendicular}} = {alpha}(t{sup 2}/T{sub c})/(T+T*), consistent with a d-wave pairing state with impurity scattering. The data imply coherent transport between conducting planes, in agreement with recent magnetoresistive measurements [J. Singleton, P. A. Goddard, A. Ardavan, N. Harrison, S. J. Blundell, J. A. Schlueter, and A. M. Kini, Phys. Rev. Lett. 88, 037001 (2002)] and in contrast to the copper oxides.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.80.054519