2D molecular superconductor to insulator transition in the β"-(BEDT-TTF)2[(H2O)(NH4)2M(C2O4)3]·18-crown-6 Series (M = Rh, Cr, Ru, Ir)

Morritt, A.L., Lopez, J.R., Blundell, T.J., Canadell, E., Akutsu, H., Nakazawa, Y., Imajo, S. and Martin, L. ORCID: 0000-0002-5330-5700, 2019. 2D molecular superconductor to insulator transition in the β"-(BEDT-TTF)2[(H2O)(NH4)2M(C2O4)3]·18-crown-6 Series (M = Rh, Cr, Ru, Ir). Inorganic Chemistry. ISSN 0020-1669

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Abstract

The series of salts β"-(BEDT-TTF)2[(H2O)(NH4)2M(C2O4)3]·18-crown-6 show ambient-pressure superconductivity when M = Cr, Rh. Evidence indicates that the previously reported Cr and Rh salts show a bulk Berezinski–Kosterlitz–Thouless superconducting transition. The isostructural ruthenium and iridium salts are reported here. The Ir salt represents the first radical-cation salt to contain a 5d tris(oxalato)metalate anion. The Ru and Ir salts do not show superconductivity but instead undergo a broad chemically induced metal to insulator transition at 155 K for ruthenium and at 100 K for iridium. The c axes of the Ru and Ir salts are much shorter than those of the Rh and Cr salts. Thus, the more stable metallic state of the Cr and Rh salts is associated with the more strongly 2D electronic systems. The different low-temperature behavior of the Ru and Ir salts, which exhibit a smaller interlayer spacing, could originate from a structural change in the anionic layer which thus can be easily transmitted to the donor layers and generate a localized state. However, another possibility is that it originates from Berezinski–Kosterlitz–Thouless effects.

Item Type: Journal article
Publication Title: Inorganic Chemistry
Creators: Morritt, A.L., Lopez, J.R., Blundell, T.J., Canadell, E., Akutsu, H., Nakazawa, Y., Imajo, S. and Martin, L.
Publisher: American Chemical Society
Date: 5 August 2019
ISSN: 0020-1669
Identifiers:
NumberType
10.1021/acs.inorgchem.9b00292DOI
Divisions: Schools > School of Science and Technology
Record created by: Linda Sullivan
Date Added: 14 Aug 2019 13:25
Last Modified: 05 Aug 2020 03:00
URI: http://irep.ntu.ac.uk/id/eprint/37310

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