Superconductivity and fermi surface studies of β"-(BEDT-TTF)2[(H2O)(NH4)2Cr(C2O4)3]·18-crown-6

Laramee, B, Ghimire, R, Graf, D, Martin, L ORCID: https://orcid.org/0000-0002-5330-5700, Blundell, TJ and Agosta, CC, 2023. Superconductivity and fermi surface studies of β"-(BEDT-TTF)2[(H2O)(NH4)2Cr(C2O4)3]·18-crown-6. Magnetochemistry, 9 (3): 64. ISSN 2312-7481

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Abstract

We report rf-penetration depth measurements of the quasi-2D organic superconductor β"-(BEDT-TTF) 2 [(H 2 O)(NH 4) 2 Cr(C 2 O 4) 3 ]·18-crown-6, which has the largest separation between consecutive conduction layers of any 2D organic metal with a single packing motif. Using a contactless tunnel diode oscillator measurement technique, we show the zero-field cooling dependence and field sweeps up to 28 T oriented at various angles with respect to the crystal conduction planes. When oriented parallel to the layers, the upper critical field, H c2 = 7.6 T, which is the calculated paramagnetic limit for this material. No signs of inhomogeneous superconductivity are seen, despite previous predictions. When oriented perpendicular to the layers, Shubnikov-de Haas oscillations are seen as low as 6 T, and from these we calculate Fermi surface parameters such as the superconducting coherence length and Dingle temperature. One remarkable result from our data is the high anisotropy of H c2 in the parallel and perpendicular directions, due to an abnormally low H c2⊥ = 0.4 T. Such high anisotropy is rare in other organics and the origin of the smaller H c2⊥ may be a consequence of a lower effective mass.

Item Type:	Journal article
Publication Title:	Magnetochemistry
Creators:	Laramee, B., Ghimire, R., Graf, D., Martin, L., Blundell, T.J. and Agosta, C.C.
Publisher:	MDPI
Date:	24 February 2023
Volume:	9
Number:	3
ISSN:	2312-7481
Identifiers:	Number Type 10.3390/magnetochemistry9030064 DOI 1736195 Other
Rights:	© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Divisions:	Schools > School of Science and Technology
Record created by:	Laura Ward
Date Added:	12 May 2023 11:28
Last Modified:	12 May 2023 11:28
URI:	https://irep.ntu.ac.uk/id/eprint/48956

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