Josephson Scanning Tunneling Spectroscopy in dx2−y2-Wave Superconductors: A Probe for the Nature of the Pseudogap in the Cuprate Superconductors

Martin Graham; Dirk K. Morr

doi:10.1103/PhysRevLett.123.017001

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Josephson Scanning Tunneling Spectroscopy in dx2−y2-Wave Superconductors: A Probe for the Nature of the Pseudogap in the Cuprate Superconductors

Martin Graham, Dirk K. Morr

DOI 10.1103/PhysRevLett.123.017001 · Physical Review Letters

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Abstract

Recent advances in the development of Josephson scanning tunneling spectroscopy (JSTS) have opened a new path for the exploration of unconventional superconductors. We demonstrate that the critical current Ic, measured via JSTS, images the spatial form of the superconducting order parameter in dx2−y2-wave superconductors around defects and in the Fulde-Ferrell-Larkin-Ovchinnikov state. Moreover, we show that Ic probes the existence of phase-incoherent superconducting correlations in the pseudogap region of the cuprate superconductors, thus providing unprecedented insight into its elusive nature. These results provide the missing theoretical link between the experimentally measured Ic and the spatial structure of the superconducting order parameter.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown