Journal
NANO LETTERS
Volume 17, Issue 4, Pages 2287-2293Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b05010
Keywords
Superconductivity; atomic layer; molecular self-assembly; surface; carrier doping; spin
Categories
Funding
- World Premier International Research Center (WPI) Initiative on Materials Nanoarchitechtonics
- JSPS KAKENHI [25247053, 16K17727, 25287070, 15H01041]
- JSPS KAKENI [25871114, 15K17465]
- MEXT KAKENHI [25110008, 26102017]
- JSPS Core-to-Core Program
- A. Advanced Research Networks
- MEXT, Japan [S-13-MS-1058, S-14-MS-2011, S-15-MS-2034]
- Grants-in-Aid for Scientific Research [17H05211, 25287070, 16K17727, 25247053, 17H05461, 15K17465, 15H02173, 15H01041] Funding Source: KAKEN
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Self-assembled organic molecules can potentially be an excellent source of charge and spin for two-dimensional (2D) atomic-layer superconductors. Here we investigate 2D heterostructures based on In atomic layers epitaxially grown on Si and highly ordered metal-phthalocyanine (MPc, M = Mn, Cu) through a variety of techniques: scanning tunneling microscopy, electron transport measurements, angle-resolved photoemission spectroscopy, X-ray magnetic circular dichroism, and ab initio calculations. We demonstrate that the superconducting transition temperature (T-c) of the heterostructures can be modified in a controllable manner. Particularly, the substitution of the coordinated metal atoms from Mn to Cu is found to reverse the T-c shift from negative to positive directions. This distinctive behavior is attributed to a competition of charge and spin effects, the latter of which is governed by the directionality of the relevant d-orbitals. The present study shows the effectiveness of molecule-induced surface doping and the significance of microscopic understanding of the molecular states in these 2D heterostructures.
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