Universal superconducting properties and two superconducting domes in unconventional superconductors

by Tanmoy Das (Indian Institute of Physics, Bangalore)

Thursday 11 Jun 2015, 11:00 → 12:00 Europe/Stockholm

Nordita West (122:026)

A fascinating aspect of superconductivity field is that despite 100 years of research, new and exciting results are being uncovered which challenge our prior understandings. Over the past three decades, unconventional superconductivity has been observed in a growing class of materials that appear neither identical to the conventional superconductors of electron-lattice coupling, nor related to each other. In this talk, I will present a comprehensive analysis of the phase diagrams across several families of superconductors including copper-oxides, heavy-fermions, iron-pnictides and iron-chalcogenides, organics, and the recently discovered oxybismuthides.[1] Surprisingly, all these families inherently possess two distinct SC domes, which can be revealed using multiple control parameters. The SC dome at or near a possible QCP possesses a lower transition temperature (Tc) whereas the second SC dome, emerging nearer a non-Fermi liquid (NFL) state has a higher Tc Comprehensive analysis reveals that the presence of two SC domes is a universal feature in unconventional superconductors. I will discuss the possible intimate relationship between NFL, electronic complexity and higher-temperature superconductivity. [1] Tanmoy Das, Christos Panagopoulos, under review.