On the Relationship Between the Critical Temperature and the London Penetration Depth in Layered Organic Superconductors

Details On the Relationship Between the Critical Temperature and the London Penetration Depth in Layered Organic Superconductors On the Relationship Between the Critical Temperature and the London Penetration Depth in Layered Organic Superconductors

2003-11-21

arxiv.org/abs/cond-mat/0311498v2

J. Phys.: Condens. Matter 16 L367-L373 (2004)

Physics

Condensed Matter

Superconductivity

5 pages, 1 figure

Scientific paper

10.1088/0953-8984/16/30/L03

We present an analysis of previously published measurements of the London penetration depth of layered organic superconductors. The predictions of the BCS theory of superconductivity are shown to disagree with the measured zero temperature, in plane, London penetration depth by up to two orders of magnitude. We find that fluctuations in the phase of the superconducting order parameter do not determine the superconducting critical temperature as the critical temperature predicted for a Kosterlitz--Thouless transition is more than an order of magnitude greater than is found experimentally for some materials. This places constraints on theories of superconductivity in these materials.

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