GLAM Special Seminar
Geballe Laboratory for Advanced Materials
Tuesday, 21 May 2019 at 10:00 a.m.
Location: McCullough, Room #335
Host: Yuri Suzuki
United States Naval Research Laboratory
ENHANCED Tc NEAR THE METAL/INSULATOR TRANSITION: A NEW TOOL IN THE SEARCH FOR SUPERCONDUCTING MATERIALS
We demonstrate empirically that several disparate classes of superconductors (including high temperature superconductors), whose only common feature is proximity to a metal/insulator transition (MIT), share a common phase diagram Tc(r). Here r is a coordinate characterizing the disorder and is completely defined in terms of measurable quantities. This remarkable phase diagram may be plausibly explained by explicitly incorporating an enhancement of the electron screening length, (which occurs near the MIT), into the BCS equation for Tc. These results can be used to optimize Tc for any novel system with a MIT, thus providing the basis for a new paradigm in the search for new superconducting materials with enhanced properties.