Disorder induced transition from type-I to type-II superconductivity in the Dirac semimetal PdTe${}_2$

Abstract

We report a doping study directed to intentionally induce disorder in PdTe${}_2$ by the isoelectronic substitution of Pt. Two single-crystalline batches Pd${}_{1-x}$Pt${}_x$Te${}_2$ have been prepared with nominal doping concentrations x = 0.05 and x = 0.10. Sample characterization by energy dispersive x-ray spectroscopy (EDX) revealed Pt did not dissolve homogeneously in the crystals. For the nominal value x = 0.10 small single crystals cut from the batch appeared to have x = 0.09, as well as the non stoichiometric composition Pd${}_{0.97}$Pt${}_{<0.004}$Te${}_{2.03}$. Magnetic and heat capacity measurements demonstrate a transition from type-I to type-II superconducting behavior upon increasing disorder. From transport measurements we calculate a residual resistivity ${\rho }_0$ = 1.4 $\mu$$\Omega$cm suffices to turn PdTe${}_2$ into a superconductor of the second kind.

7 pages, 5 figures. SM: 6 pages, 3 figures

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Cited by in corpus (1)

• Type-II superconductivity in the Dirac semimetal PdTe2