Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 75: Poster Session: Transport 1
TT 75.20: Poster
Donnerstag, 23. März 2017, 15:00–19:00, P2-EG
Large magnetoresistance in single radical molecular junctions — •Sebastian Hambsch1, Ryoma Hayakawa1, 2, Amin Karimi1, Jannic Wolf1, Thomas Huhn1, Martin Sebastian Zöllner3, Carmen Herrmann3 und Elke Scheer1 — 1University of Konstanz, 78457 Konstanz — 2NIMS, Tsukuba 305-0044, Japan — 3University of Hamburg, 20146 Hamburg
We present the charge transport properties of single radical molecule junctions formed by a break junction technique at 4.2 K in magnetic field B. In this study, stable and neutral radical molecules based on an oligo(p-phenylene ethynylene) (OPE) backbone (TEMPO-OPE) were placed on a freestanding gold (Au) bridge. We observe large positive magnetoresistance (MR) up to 287 % at 4T from TEMPO-OPE molecules when B was applied perpendicular to the sample plane [R. Hayakawa et al. Nano Lett. 16, 4960 (2016)]. The averaged MR was one order of magnitude larger than that of the analogous non-radical OPE molecule. The analysis of the MR, of IVs and of inelastic electron tunneling spectra reveal an effective reduction of the electronic coupling between the current-carrying molecular orbital and the electrodes with increasing B. Our findings thus provide a new physical approach for tuning the charge transport via radical molecules.