Superconductivity in the topological semimetal YPtBi

Andrew P. Hope; Johnpierre Paglione; Kevin Kirshenbaum; Nicholas P. Butch; P. Syers

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Superconductivity in the topological semimetal YPtBi

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arxiv 1109.0979 v2 pith:LZYNMQZS submitted 2011-09-05 cond-mat.supr-con cond-mat.mes-hall

Nicholas P. Butch , P. Syers , Kevin Kirshenbaum , Andrew P. Hope , Johnpierre Paglione This is my paper · ORCID

classification cond-mat.supr-concond-mat.mes-hall

keywords magnetoresistancesuperconductivityyptbicriticalsemimetalspin-orbitsurfacetopological

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The noncentrosymmetric Half Heusler compound YPtBi exhibits superconductivity below a critical temperature T_c = 0.77 K with a zero-temperature upper critical field H_c2(0) = 1.5 T. Magnetoresistance and Hall measurements support theoretical predictions that this material is a topologically nontrivial semimetal having a surprisingly low positive charge carrier density of 2 x 10^18 cm^-3. Unconventional linear magnetoresistance and beating in Shubnikov-de Haas oscillations point to spin-orbit split Fermi surfaces. The sensitivity of magnetoresistance to surface roughness suggests a possible contribution from surface states. The combination of noncentrosymmetry and strong spin-orbit coupling in YPtBi presents a promising platform for the investigation of topological superconductivity.

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