Scanning Josephson spectroscopy on the atomic scale

Randeria, Mallika T.; Feldman, Benjamin E.; Drozdov, Ilya K.; Yazdani, Ali

doi:10.1103/PhysRevB.93.161115

Scanning Josephson spectroscopy on the atomic scale

Journal Article · Thu Apr 28 04:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.161115· OSTI ID:2588772

Randeria, Mallika T. ^[1]; Feldman, Benjamin E. ^[1]; Drozdov, Ilya K. ^[2]; ^[1]

Princeton University, NJ (United States)
Princeton University, NJ (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)

The Josephson effect provides a direct method to probe the strength of the pairing interaction in superconductors. By measuring the phase fluctuating Josephson current between a superconducting tip of a scanning tunneling microscope and a BCS superconductor with isolated magnetic adatoms on its surface, we demonstrate that the spatial variation of the pairing order parameter can be characterized on the atomic scale. This system provides an example where the local pairing potential suppression is not directly reflected in the spectra measured via quasiparticle tunneling. Spectroscopy with such superconducting tips also shows signatures of previously unexplored Andreev processes through individual impurity-bound Shiba states. Furthermore, the atomic resolution achieved here establishes scanning Josephson spectroscopy as a promising technique for the study of novel superconducting phases.

View Accepted Manuscript (DOE)

Research Organization:: Princeton University, NJ (United States)

Sponsoring Organization:: Princeton Nanoscale Microscopy Laboratory; USDOE

Grant/Contract Number:: FG02-07ER46419

OSTI ID:: 2588772

Alternate ID(s):: OSTI ID: 1249886

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 16 Vol. 93; ISSN 2469-9950; ISSN 2469-9969

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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