Eur. Phys. J. B 51, 53-60 (2006)
https://doi.org/10.1140/epjb/e2006-00199-4

Pressure dependence of the Shubnikov-de Haas oscillation spectrum of β"-(BEDT-TTF)₄(NH₄)[ Cr(C₂ O₄)₃] .DMF

¹ Laboratoire National des Champs Magnétiques Pulsés (UMR 5147: Unité Mixte de Recherche CNRS - Université Paul Sabatier, INSA de Toulouse.) , 143 avenue de Rangueil, 31400 Toulouse, France
² Institució Catalana de Recerca i Estudis Avançats (ICREA), 08010 Barcelona, Spain
³ Institut de Ciència de Materials de Barcelona (ICMAB - CSIC), Campus UAB, 08193 Bellaterra, Catalunya, Spain
⁴ Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432 Chernogolovka, MD, Russia

Corresponding author: ^a audouard@lncmp.org

Received: 23 January 2006
Revised: 15 March 2006
Published online: 31 May 2006

Abstract

The Shubnikov-de Haas (SdH) oscillation spectra of the β"-(BEDT-TTF)₄(NH₄)[ Cr(C₂O₄)₃] .DMF organic metal have been studied in pulsed magnetic fields of up to either 36 T at ambient pressure or 50 T under hydrostatic pressures of up to 1 GPa. The ambient pressure SdH oscillation spectra can be accounted for by up to six fundamental frequencies which points to a rather complex Fermi surface (FS). A noticeable pressure-induced modification of the FS topology is evidenced since the number of frequencies observed in the spectra progressively decreases as the pressure increases. Above 0.8 GPa, only three compensated orbits are observed, as it is the case for several other isostructural salts of the same family at ambient pressure. Contrary to other organic metals, of which the FS can be regarded as a network of orbits, no frequency combinations are observed for the studied salt, likely due to high magnetic breakdown gap values or (and) high disorder level evidenced by Dingle temperatures as large as ≃7 K.