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Sci Rep. 2018 May 23;8(1):8057. doi: 10.1038/s41598-018-26428-y.

Kondo effect and enhanced magnetic properties in gadolinium functionalized carbon nanotube supramolecular complex.

Author information

1
Nano-Scale Transport Physics Laboratory, School of Physics, and DST/NRF Centre of Excellence in Strong materials, University of the Witwatersrand, Johannesburg, South Africa.
2
Highly Correlated Matter Research Group, Department of Physics, University of Johannesburg, Auckland Park, 2006, South Africa.
3
Max Planck Institute for Chemical Physics of Solids, Nöthnitzerstr. 40, D-01187, Dresden, Germany.
4
CIRIMAT, Université de Toulouse, CNRS, INPT, UPS, UMR CNRS-UPS-INP No. 5085, Université Toulouse Paul Sabatier, Bât. CIRIMAT, 118, route de Narbonne, 31062, Toulouse, cedex 9, France.
5
School of Chemistry, University of the Witwatersrand, Johannesburg, South Africa.
6
Nano-Scale Transport Physics Laboratory, School of Physics, and DST/NRF Centre of Excellence in Strong materials, University of the Witwatersrand, Johannesburg, South Africa. Somnath.Bhattacharyya@wits.ac.za.

Abstract

We report on the enhancement of magnetic properties of multiwalled carbon nanotubes (MWNTs) functionalized with a gadolinium based supramolecular complex. By employing a newly developed synthesis technique we find that the functionalization method of the nanocomposite enhances the strength of magnetic interaction leading to a large effective moment of 15.79 µB and non-superparamagnetic behaviour unlike what has been previously reported. Saturating resistance at low temperatures is fitted with the numerical renormalization group formula verifying the Kondo effect for magnetic impurities on a metallic electron system. Magnetoresistance shows devices fabricated from aligned gadolinium functionalized MWNTs (Gd-Fctn-MWNTs) exhibit spin-valve switching behaviour of up to 8%. This study highlights the possibility of enhancing magnetic interactions in carbon systems through chemical modification, moreover we demonstrate the rich physics that might be useful for developing spin based quantum computing elements based on one-dimensional (1D) channels.

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