Fully gapped type-II superconductivity in Pt-doped IrTe2 near critical doping
Aastha Vasdev, Deepti Rana, Amit Vashist, Yogesh Singh, Goutam Sheet
DOI 10.1103/PhysRevB.105.094509 · Physical Review B
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Abstract
The Dirac point in Pt-doped IrTe2 is known to be tuned by controlling the doping concentration. For 10% Pt, it is seen that the Dirac point exists close to the Fermi energy of the system. This leads to the expectation that, for such doping, the system might host unconventional (topological) superconductivity. Here, we present a detailed microscopic and spectroscopic investigation of Pt−IrTe2 under an ultrahigh vacuum, low-temperature scanning tunneling microscope. We find that, for the crystals of Ir0.9Pt0.1Te2, the surface shows patches of atomic scale over which defects are seen to be randomly distributed. Tunneling spectroscopy reveals that Ir0.9Pt0.1Te2 condenses into a fully gapped Bardeen-Cooper-Schrieffer-like (BCS) s-wave superconducting state. The superconducting gap was measured to be 460μeV at 310 mK. The value of 2Δ0/kBTc∼6 is consistent with a conventional BCS superconductor in the strong-coupling limit. The conventional behavior is surprising, given the topological band structure of the material.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ir0.9Pt0.1Te2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.8 | Pressure not reported | onset |
| Ir0.9Pt0.1Te2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.75 | Pressure not reported | zero_resistance |
| IrTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | Pressure not reported | unknown |
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