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Observation of strong Kondo like features and co-tunnelling in superparamagnetic GdCl3 filled 1D nanomagnets

Ncube, Siphephile and Coleman, Chistopher and de Sousa, Alvaro S. and Nie, Chunyang and Lonchambon, Pierre and Flahaut, Emmanuel and Strydom, Andrew and Bhattacharyya, Somnath Observation of strong Kondo like features and co-tunnelling in superparamagnetic GdCl3 filled 1D nanomagnets. (2018) Journal of Applied Physics, 123 (21). 213901/1-213901/7. ISSN 0021-8979

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Official URL: http://doi.org/10.1063/1.5024346

Abstract

Filling of carbon nanotubes has been tailored over years to modify the exceptional properties of the 1-dimensional conductor for magnetic property based applications. Hence, such a system exploits the spin and charge property of the electron, analogous to a quantum conductor coupled to magnetic impurities, which poses an interesting scenario for the study of Kondo physics and related phenomena. We report on the electronic transport properties of MWNTs filled with GdCl3 nanomagnets, which clearly show the co-existence of Kondo correlation and cotunelling within the superparamagnetic limit. The Fermi liquid description of the Kondo effect and the interpolation scheme are fitted to the resistance-temperature dependence yielding the onset of the Kondo scattering temperature and a Kondo temperature for this nanocomposite, respectively. Cotunneling of conduction electrons interfering with a Kondo type interaction has been verified from the exponential decay of the intensity of the fano shaped nonzero bias anomalous conductance peaks, which also show strong resonant features observed only in GdCl3 filled MWNT devices. Hence, these features are explained in terms of magnetic coherence and spin-flip effects along with the competition between the Kondo effect and co-tunneling. This study raises a new possibility of tailoring magnetic interactions for spintronic applications in carbon nanotube systems.

Item Type:Article
Additional Information:Thanks to AIP editor. The original PDF of the article can be found at https://aip.scitation.org/doi/10.1063/1.5024346
HAL Id:hal-01812545
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Max-Planck-Institut für Chemische Physik Fester Stoffe - CPFS (GERMANY)
Other partners > University of Johannesburg - UJ (SOUTH AFRICA)
Other partners > University of the Witwatersrand - WITS (SOUTH AFRICA)
Laboratory name:
Funders:
NRF (93549) - URC/FRC of UJ
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Deposited By: cirimat webmestre
Deposited On:11 Jun 2018 13:11

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