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I will discuss superconductivity in a class is the quasi-two-dimensional organic charge transfer salts (BEDT-TTF)2X, particularly the \kappa, \beta, \beta" and \lambda phases. The phenomenology of the superconducting state is still a matter of contention. I will critically review the experimental situation [1], focusing on the key experimental results that may distinguish between rival theories of superconductivity, particularly probes of the pairing symmetry and measurements of the superfluid stiffness. I will then discuss some strongly correlated theories of superconductivity, in particular the resonating valence bond (RVB) theory of superconductivity [2]. I will show that this theory predicts that magnetic frustration can drive the superconductor into a state with broken time reversal symmetry [3]. I will also discuss the relevance of this theory to another class of organic superconductor namely the \beta' -[Pd(dmit)2]2X family.
[1] B.J. Powell and R.H. McKenzie, J. Phys.: Condens. Matter 18, R827 (2006). [2] B.J. Powell and R.H. McKenzie, Phys. Rev. Lett. 94, 047004 (2005). [3] B.J. Powell and R.H. McKenzie, Phys. Rev. Lett. 98, 027005 (2007). |
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