Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 24: Molecular Electronics and Photonics
TT 24.3: Vortrag
Dienstag, 2. April 2019, 10:00–10:15, H22
High Magnetoresistance and Kondo Resonance in Radical Molecular Junctions — •Gautam Mitra1, David Weber1, Jonathan Low2, Sujun Wei2, Karol Francisco2, Luis Campos2, and Elke Scheer1 — 1Department of Physics, University of Konstanz, Germany — 2Department of Chemistry, Columbia University, Newyork, United States
The presence of an unpaired electron in organic radical molecules gives rise to intrinsic magnetic properties when coupled to nonmagnetic electrodes. In the present study, we report on the magnetic behavior of polychlorotriphenylmethyl radical molecule [1] junctions using the mechanically controlled break junction technique. The transport measurements were carried out at low temperatures down to 1.5K. We have observed very high positive and negative magnetoresistance up to 140% for a magnetic field of 6T applied perpendicular to the current direction. Alongside, we also observe significant zero bias anomalies corresponding to Kondo temperatures around 9K, originates from a spin flipping Kondo mediated transport channel as observed for a similar molecule contacted by rigid electrodes before [2]. Meanwhile the exact origin of magnetoresistance behavior from this molecule is still unknown and open for further investigation. By changing the interelectrode spacing, we follow the development of the Kondo resonance and magnetoresistance which further opens up the relation between coupling of electrodes with molecule.
Armet, O. et.al. J. Phys. Chem. 1987, 91, 5608-5616
Frisenda, R. et.al. Nano Lett. 2015, 15, 3109-3114