Van Hove Singularities, Superconductivity, and the Josephson Diode Effect in NiTe2 and PdTe2
Emily C. McFarlane, Antonio Sanna, Matthew J. Gilbert, Jonas A. Krieger, Mihir Date, Gabriele Domaine, Banabir Pal, Anirban Chakraborty, Pranava K. Sivakumar, Procopios C. Constantinou, Anna Hartl, Enrico G. Della Valle, Camilla Pellegrini, Vladimir N. Strocov, Stuart S. P. Parkin, Niels B. M. Schröter
DOI 10.1103/hp1t-zd7y · Physical Review Letters
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Abstract
Superconductivity in the transition-metal dichalcogenide PdTe2 has been attributed to the proximity of a three-dimensional Van Hove singularity to the Fermi level. In isostructural NiTe2, recently used as the weak link in a Josephson diode, a similar Van Hove singularity has been predicted to occur, but superconductivity is mysteriously absent. Using bulk-sensitive soft x-ray angle-resolved photoemission spectroscopy, we reveal that this Van Hove singularity lies even closer to the Fermi level in NiTe2 than in PdTe2. To explain the lack of superconductivity in NiTe2, we perform ab initio calculations incorporating the Kukkonen Overhauser interaction, showing that an incipient magnetic instability suppresses superconductivity at an unprecedented scale. Finally, we present a tight-binding model that links the Van Hove singularity to a sign change in the Josephson diode effect at small magnetic fields, suggesting a new mechanism for Josephson diodes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PdTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.7 | Pressure not reported | unknown |
| PdTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.64 | Pressure not reported | unknown |
| PdTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.38 | Pressure not reported | unknown |
| NiTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.14 | Pressure not reported | unknown |
| NiTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.5 | Pressure not reported | unknown |
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