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Magnetotransport in novel low-dimensional carbon nanomaterials

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Several novel low-dimensional carbon nanomaterials, scilicet graphene mono- and bilayers, single-walled carbon nanotubes (SWNTs) a... Weiterlesen
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Beschreibung

Several novel low-dimensional carbon nanomaterials, scilicet graphene mono- and bilayers, single-walled carbon nanotubes (SWNTs) and SWNTs filled with Dy@C82 endohedral metallofullerenes (metallofullerene peapods), were investigated by electrical magnetotransport measurements at low temperatures in external magnetic fields of different orientations. The highlights of this study are that for both SWNTs and metallofullerene peapods, significant negative magnetoresistance (approx. 8 to 14 %) could be observed for axially oriented magnetic fields in some of the samples, where this effect vanished for the perpendicular magnetic field orientation. Other nanotubes did not show this effect at all. We assign the clearly different magnetotransport of the nanotubes in the parallel magnetic field configuration to different chiralities. Moreover, height undulations of the differential conductance Coulomb blockade peaks of SWNTs accompanied by shifts of the respective peak positions along the gate voltage direction were observed. Great importance was attached to combining the magnetotransport measurements with further investigations as high-resolution TEM or AFM on the very same sample.

Autorentext

Dirk Obergfell, Dr. rer. nat.: physics studies at the Universityof Heidelberg, Germany. Diploma in physics 11/2003. PhD work atthe Max Planck Institute for Solid State Research, Stuttgart,Germany. PhD degree in physics, University of Tübingen, Germany,02/2009.



Klappentext

Several novel low-dimensional carbon nanomaterials,scilicet graphene mono- and bilayers, single-walledcarbon nanotubes (SWNTs) and SWNTs filled with Dy@C82endohedral metallofullerenes (metallofullerenepeapods), were investigated by electricalmagnetotransport measurements at low temperatures inexternal magnetic fields of different orientations.The highlights of this study are that for both SWNTsand metallofullerene peapods, significant negativemagnetoresistance (approx. 8 to 14 %) could beobserved for axially oriented magnetic fields in someof the samples, where this effect vanished for theperpendicular magnetic field orientation. Othernanotubes did not show this effect at all. We assignthe clearly different magnetotransport of thenanotubes in the parallel magnetic fieldconfiguration to different chiralities. Moreover,height undulations of the differential conductanceCoulomb blockade peaks of SWNTs accompanied by shiftsof the respective peak positions along the gatevoltage direction were observed. Great importance wasattached to combining the magnetotransportmeasurements with further investigations ashigh-resolution TEM or AFM on the very same sample.

Produktinformationen

Titel: Magnetotransport in novel low-dimensional carbon nanomaterials
Autor:
EAN: 9783838106007
ISBN: 978-3-8381-0600-7
Format: Kartonierter Einband
Herausgeber: Südwestdeutscher Verlag für Hochschulschriften AG
Genre: Sonstiges
Anzahl Seiten: 212
Gewicht: 332g
Größe: H220mm x B150mm x T13mm
Jahr: 2015