Effects of electron correlations and chemical pressures on superconductivity of β''-type organic compounds

Imajo, S., Akutsu, H., Akutsu-Sato, A., Morritt, A.L., Martin, L. ORCID: 0000-0002-5330-5700 and Nakazawa, Y., 2019. Effects of electron correlations and chemical pressures on superconductivity of β''-type organic compounds. Physical Review Research, 1 (3): 033184. ISSN 2643-1564

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Abstract

We investigate low-temperature electronic states of the series of organic conductors β'' - [bis(ethylenedithio)tetrathiafulvalene] 4[(H3O)M(C2O4)3] G, where M and G represent trivalent metalions and guest organic molecules, respectively. Our structural analyses reveal that the replacement of M and G give rise to systematic change in the cell parameters, especially in the b-axis length, which has a positive correlation with the superconducting transition temperature Tc. Analysis of temperature and magnetic field dependences of the electrical resistance including the Shubnikov–de Haas oscillations elucidates that the variation of charge disproportionation, the effective mass, and the number of itinerant carriers can be systematically explained by the change of the b-axis length. The changes of the transfer integrals induced by stretching/compressing the b axis are confirmed by the band calculation. We discuss that electron correlations in quarter-filled electronic bands lead to charge disproportionation and the possibility of a novel pairing mechanism of superconductivity mediated by charge degrees of freedom.

Item Type: Journal article
Publication Title: Physical Review Research
Creators: Imajo, S., Akutsu, H., Akutsu-Sato, A., Morritt, A.L., Martin, L. and Nakazawa, Y.
Publisher: American Physical Society
Date: December 2019
Volume: 1
Number: 3
ISSN: 2643-1564
Identifiers:
NumberType
10.1103/physrevresearch.1.033184DOI
1290580Other
Rights: © Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Divisions: Schools > School of Science and Technology
Record created by: Linda Sullivan
Date Added: 20 Mar 2020 11:10
Last Modified: 22 Apr 2020 10:43
URI: http://irep.ntu.ac.uk/id/eprint/39417

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