Andreev spectroscopy of CrO2 thin films on TiO2 and Al2O3

Karen A. Yates, M. S. Anwar, Jan Aarts, O. Conde, Matthias Eschrig, Tomas Lofwander, Lesley F. Cohen

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Here we analyse the spectroscopic information gathered at a number of single
CrO2/Pb interfaces. We examine thin films requiring additional interfacial layers to generate long-range spin triplet proximity effect superconductivity (CrO2/TiO2) or not (CrO2/Al2O3). We analyse the data using two theoretical models and explore the use of a parameter-free method to determine the agreement between the models and experimental observations, showing the necessary temperature range that would be required to make a definitive statement. The use of the excess current as a further tool to distinguish between models is also examined. The analysis of the spectra demonstrates that the temperature dependence of the normalised zero-bias conductance is independent of the substrate onto which the films are grown. This result has important implications for the engineering of interfaces required for the long-range spin triplet proximity effect.

Original languageEnglish
Article number67005
Number of pages5
JournalEurophysics Letters
Publication statusPublished - 7 Oct 2013

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