Volume 103, Number 6, September 2013
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||22 October 2013|
Andreev spectroscopy of CrO2 thin films on TiO2 and Al2O3
1 Physics Department, The Blackett Laboratory, Imperial College - London, SW7 2AZ, UK, EU
2 Physics Department, University of Leiden - Leiden, The Netherlands, EU
3 Department of Physics and ICEMS, Faculty of Sciences of the University of Lisbon Campo Grande, Ed. C8 1749-016 Lisboa, Portugal, EU
4 SEPnet and Hubbard Theory Consortium, Department of Physics, Royal Holloway, University of London Egham, Surrey, TW20 0EX, UK, EU
5 Department of Microtechnology and Nanoscience - MC2, Chalmers University of Technology SE-412 96 Göteborg, Sweden, EU
Received: 4 April 2013
Accepted: 16 September 2013
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.
PACS: 74.45.+c – Proximity effects; Andreev reflection; SN and SNS junctions / 72.25.Mk – Spin transport through interfaces / 85.75.-d – Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields
© EPLA, 2013
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