Exotic Superconducting Properties in the Electron-Hole Compensated Heavy Fermion `Semimetal' URu2Si2

TL;DR

This paper reports novel superconducting properties in URu2Si2, highlighting multi-band, unconventional superconductivity with two gaps and unique thermal transport behavior in a heavy fermion system.

Contribution

It demonstrates the existence of a new type of unconventional superconductivity with two distinct gaps and unusual thermal conductivity behavior in URu2Si2.

Findings

First order transition at Hc2 with entropy reduction

Evidence for multi-band superconductivity with compensated electronic structure

Presence of two gaps with different nodal topologies

Abstract

We show that the charge and thermal transport measurements on ultraclean crystals of URu2Si2 reveal a number of unprecedented superconducting properties. The uniqueness is best highlighted by the peculiar field dependence of thermal conductivity including the first order transition at Hc2 with a reduction of entropy flow. This is a consequence of multi-band superconductivity with compensated electronic structure in the hidden order state of this system. We provide strong evidence for a new type of unconventional superconductivity with two distinct gaps having different nodal topology.