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Imaging of spatial structures of fiske-, shapiro-, and photon-assisted tunnelling step states in Josephson tunnel junctions

Doderer, T.; Mayer, B.; Kruelle, C.; Huebener, R. P.; Quenter, D.; Niemeyer, J.; Fromknecht, R.; Poepel, R.; Ustinov, A. V.; Klein, U.; Hinken, J. H.

Using Low Temperature Scanning Electron Microscopy (LTSEM) the Fiske-Steps generated in a Josephson tunnel junction in the presence of a magnetic field have been studied. Spatial structures of the beam-induced change of the maximum step currents and also of the voltage signals of current biased step states have been observed with a spatial resolution of a few μm. In combination with a microwave source LTSEM offers the possibility to study the spatial distribution of rf-induced constant-voltage steps (Shapiro-steps) and of photon-assisted tunnelling steps. In the former case the spatial distribution of the maximum step current of various Shapiro-steps has been imaged. In the latter case we obtained evidence for the nucleation of an inhomogeneous energy gap state in the junction electrodes due to microwave irradiation.

DOI: 10.1016/S0921-4526(90)80933-A
Zitationen: 1
Zitationen: 2
Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 08.1990
Sprache Englisch
Identifikator ISSN: 0921-4526, 1873-2135
KITopen-ID: 1000078032
Erschienen in Physica / B
Verlag Elsevier
Band 165-166
Heft Part 1
Seiten 167–168
Nachgewiesen in Scopus
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