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

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.

4 pages, 4 figures, accepted for publication in Phys. Rev. Lett

References in corpus (3)

• Metal-Insulator-Like Behavior in Semimetallic Bismuth and Graphite
• Nodal Structure of Unconventional Superconductors Probed by the Angle Resolved Thermal Transport Measurements
• Interplay between SDW and induced local moments in URu2Si2

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• Flux Line Lattice Melting and the Formation of a Coherent Quasiparticle Bloch State in the Ultraclean URu${}_2$Si${}_2$ Superconductor
• On the destruction of the hidden order in URu${}_2$Si${}_2$ by a strong magnetic field
• Disorder-sensitive superconductivity in the iron silicide Lu${}_2$Fe${}_3$Si${}_5$ studied by the Lu-site substitutions
• Hydrostaticity and hidden order: effects of experimental conditions on the temperature-pressure phase diagram of URu2Si2
• Anomalous Thermal Conductivity of Semi-Metallic Superconductors with Electron-Hole Compensation
• Abrikosov flux-lines in two-band superconductors with mixed dimensionality
• Uncovering the hidden order in URu2Si2: Identification of Fermi surface instability and gapping