The normal state electronic structure of unconventional superconductors

In unconventional superconductors, the normal state electronic properties often strongly constrain the mechanism of superconductivity, and the electronic structure depends strongly on the crystal structure.  I will discuss our recent angle-resolved photoemission (ARPES) studies on two materials where normal state electronic structure as well as crystal structure plays an important role in their propensity towards superconductivity.  The first is LaNiGa₂, a purported time-reversal-symmetry breaking superconductor, where recent availability of single-crystals has prompted a re-evaluation of the electronic structure and mechanism of superconductivity.  The second is WTe₂, a material that can be rendered superconducting in several different ways, most of which involve increasing electron density.  We discuss changes in electronic and crystal structure upon electron doping.

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