Abstract
We study the effects of the proximity to an electronic topological transition (ETT) on the superconducting properties of low-dimensional materials, such as the high-T c cuprates and the κ-phase of BEDT-TTF-based organic superconductors. An ETT takes place when some external agent, such as an increase of the impurity concentration, doping, hydrostatic pressure, or anisotropic strain, modifies the topology of the Fermi surface of an electronic system. As a function of the critical parameter z, measuring the distance of the chemical potential from the ETT, we recover a non-monotonic behavior for the superconducting gap at T = 0, the critical temperature T c, and the impurity scattering rate for quasi-2D systems, regardless of the pairing symmetry of the order parameter. This has to be contrasted with the monotonic, nearly step-like z-dependence of the same quantities in the 3D case. Such a non-monotonic behavior is in agreement with the trend observed for T c as a function of pressure and other material specific quantities in several high-T c cuprate compounds. On the other hand, higher pressures than those reported in the literature (~ 10 kbar) should be investigated, in order to find evidence for ETT effects in the BEDT-TTF-based salts. We eventually comment on the effect of an ETT on the fluctuation range of anisotropic superconductors near T c.
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Angilella, G.G.N., Piegari, E., Pucci, R., Varlamov, A.A. (2001). Anisotropic low-dimensional superconductors close to an electronic topological transition. In: Hochheimer, H.D., Kuchta, B., Dorhout, P.K., Yarger, J.L. (eds) Frontiers of High Pressure Research II: Application of High Pressure to Low-Dimensional Novel Electronic Materials. NATO Science Series, vol 48. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0520-3_27
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DOI: https://doi.org/10.1007/978-94-010-0520-3_27
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