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: 0000-0002-5330-5700, Blundell, T.J. and Agosta, C.C., 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

1736195_Martin.pdf - Published version

Download (713kB) | Preview


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
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 (
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

Actions (login required)

Edit View Edit View


Views per month over past year


Downloads per month over past year