Electron transport through Ni/1,4-benzenedithiol/Ni single-molecule junctions under magnetic field

被引：0

作者：

Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan ^{[1
]}

机构：

[1] Horiguchi, Kazunori

[2] Sagisaka, Takami

[3] Kurokawa, Shu

[4] Sakai, Akira

来源：

Sakai, A. (sakai.akira.4z@kyoto-u.ac.jp) | 1600年 / American Institute of Physics Inc.卷 / 113期

关键词：

We have studied electron transport through Ni/1,4-benzenedithiol (BDT)/Ni single molecule junctions at cryogenic temperatures under magnetic field up to 250 mT. Instead of examining magnetoresistance (MR) of individual junctions, we measured the conductance of many junctions under a constant magnetic field and investigated how a single-molecule peak in a conductance histogram shifts with the field strength. We found that the single-molecule resistance at 77 K, deduced from the conductance peak position, shows a hysteresis against the field strength and takes a maximum around 50 mT when the magnetic field increases from 0 T to 150 mT. The observed resistance change yields a MR of ∼ (80 - 90) for Ni/BDT/Ni single molecule junctions. This MR is higher than experimental MR reported for non-conjugating molecules but consistent with high theoretical MR predicted for π-conjugated molecules such as BDT. We have also investigated the nonlinearity of the current-voltage (I - V) characteristics of Ni/BDT/Ni junctions under 0 T and 150 mT and found that the nonlinearity changes its sign from negative at 0 T to positive at 150 mT. This result suggests that the junction transmission spectrum at 0 T should have a low-lying peak within ± 0.1 eV from the Fermi level, but the peak moves out of the bias window when the magnetic field increases to 150 mT. The observed field-induced change in the I - V nonlinearity is qualitatively consistent with theoretical I - V curves of Ni/BDT/Ni calculated for magnetized and non-magnetized Ni electrodes. © 2013 AIP Publishing LLC;

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摘要：

Journal article (JA)

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