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Fundamental study of unconventional superconductors | |
Calculations within the Eliashberg theory The BCS theory describes well conventional superconductors in which the pairing is mediated by phonons and the electron-phonon coupling is rather weak. In most unconventional superconductors, the electron-boson coupling is strong and this has a series of consequences that cannot be explained within the BCS theory. The Eliashberg theory is more general than BCS and allows describing both weak-coupling and strong-coupling superconductors. Moreover, it can be adapted to describe (at least in a semi-phenomenological way) systems in which the coupling is mediated by any kind of bosonic excitations. We use the Eliashberg theory to:
| ![]() Experimental (symbol) and theoretical (lines) behaviour of the gaps of Mn-doped MgB2 as a function of the critical temperature |
Effect of disorder induced by self-irradiation: Critical temperature as a function of the residual resisitivity in PuCoGa5 (symbols) compared to the predictions of Eliashberg theory for s-wave and d-wave order parameter. | |
Gaps and critical temperature in Ba(Fe,Co)2As2, as a function of the Co content. Comparison of experimental values and predictions of the three-band Eliashberg model. | |
LaTEST - Department of Applied Science and Technology, Politecnico di Torino corso Duca degli Abruzzi 24, 10129 Torino (TO) - Italy ![]() |