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Andreev spectroscopy of CrO2 thin films on TiO2 and Al2O3

K.A. Yates ; M.S. Anwar ; J.F.M. Aarts ; O. Conde ; M. Eschrig ; Tomas Löfwander (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; L.F. Cohen
EPL (0295-5075). Vol. 103 (2013), 6,
[Artikel, refereegranskad vetenskaplig]

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 (CrO 2/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. © Copyright EPLA, 2013.



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Denna post skapades 2013-11-18.
CPL Pubid: 186955

 

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