Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 90: Quantum Impurities and Kondo Physics
TT 90.6: Vortrag
Donnerstag, 12. März 2026, 18:15–18:30, CHE/0091
Conventional and singlet-triplet Kondo effect in radical single-molecule junctions — •Elke Scheer1, Gautam Mitra1, Jueting Zheng1,2, Michael Deffner3, Karen Schaefer3, Jonathan Z. Low3, Luis M. Campos4, Carmen Herrmann4, and Theo A. Costi5 — 1Uni Konstanz, Germny — 2Xiamen Univ., China — 3Univ. Hamburg, Germany — 4Columbia Univ., USA — 5Research Center Jülich, Germany
The Blatter radical has been suggested as a building block in future molecular spintronic devices due to its expected long-spin lifetime [1]. Whether its radical character is maintained in single-molecule junctions depends on the environment [2]. For about 25% of single-molecule junctions investigated at low-temperature (4.2 K) we observe zero-bias anomalies that can be assigned to the Kondo effect and hence support the radical character. Additionally, a strong negative magnetoresistance is observed in junctions that do not reveal a zero-bias anomaly. By combining distance-dependent and magnetic-field-dependent measurements, quantum-chemical and quantum-transport calculations, we show that both observations can be consistently explained by a singlet-triplet Kondo model. [3,4].
[1] L. Ji et al., Adv. Mater. 32, e1908015 (2020)
[2] J. Z. Low et al., Nano Lett. 19, 2543 (2019)
[3] J. Paaske et al., Nat. Phys. 2, 460 (2006)
[4] G. Mitra et al., Chem 11, 102500 (2025)
Keywords: singlet-triplet Kondo effect; magnetoresistance; zero-bias anomaly; single-molecule junction