Enhanced, homogeneous type II superconductivity in Cu-intercalated PdTe${}_2$

Abstract

Though the superconducting phase of the type-II Dirac semimetal PdTe${}_2$ was shown to be conventional in nature, the phase continued to be interesting in terms of its magnetic properties. While certain experiments indicated an unexpected type-I superconducting phase, other experiments revealed formation of vortices under the application of magnetic fields. Recently, scanning tunneling spectroscopy (STS) experiments revealed the existence of a mixed phase where type-I and type-II behaviours coexist. Here, based on our temperature and magnetic field dependent STS experiments on Cu-intercalated PdTe${}_2$ we show that as the critical temperature of the superconducting phase goes up from 1.7 K to 2.4 K on Cu-intercalation, the mixed phase disappears and the system becomes homogeneously type-II. This may be attributed to an averaging effect caused by quasiparticle exchange between type-I and type-II domains mediated by the Cu atoms and to decreased coherence length due to increased disorder.

arXiv comment4 pages , 3 figures

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Cited by in corpus (3)

• Atomic diffusion-induced polarization and superconductivity in topological insulator-based heterostructures
• Planar Hall effect in Cu intercalated PdTe${}_2$
• Disorder induced transition from type-I to type-II superconductivity in the Dirac semimetal PdTe${}_2$