In-gap states in superconducting LaAlO3−SrTiO3 interfaces observed by tunneling spectroscopy
Lukas Kuerten, Christoph Richter, Narayan Mohanta, Thilo Kopp, Arno Kampf, Jochen Mannhart, Hans Boschker
DOI 10.1103/PhysRevB.96.014513 · Physical Review B
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Abstract
We identified quasiparticle states at well-defined energies inside the superconducting gap of the electron system at the LaAlO3−SrTiO3 interface using tunneling spectroscopy. The states are found only in a number of samples and depend upon the thermal-cycling history of the samples. The states consist of a peak at zero energy and other peaks at finite energies, symmetrically placed around zero energy. These peaks disappear, together with the superconducting gap, with increasing temperature and magnetic field. We discuss the likelihood of various physical mechanisms that are known to cause in-gap states in superconductors and conclude that none of these mechanisms can easily explain the results. The conceivable scenarios are the formation of Majorana bound states, Andreev bound states, or the presence of an odd-frequency spin triplet component in the superconducting order parameter.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaAlO3-SrTiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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