Eur. Phys. J. B 71, 203-209 (2009)
https://doi.org/10.1140/epjb/e2009-00306-1

Indications for the coexistence of closed orbit and quantum interferometer with the same cross section in the organic metal β^′′-(ET)₄(H₃O)[ Fe(C₂O₄)₃] .C₆H₄Cl₂: persistence of Shubnikov-de Haas oscillations above 30 K

¹ Laboratoire National des Champs Magnétiques Intenses (UPR 3228 CNRS, INSA, UJF, UPS) 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, Moscow oblast, Russia

Corresponding author: ^a audouard@lncmp.org

Received: 20 April 2009
Revised: 24 June 2009
Published online: 11 September 2009

Abstract

Shubnikov-de Haas (SdH) and de Haas-van Alphen (dHvA) oscillations spectra of the quasi-two dimensional charge transfer salt β^′′-(ET)₄(H₃O)[ Fe(C₂O₄)₃] .C₆H₄Cl₂ have been investigated in pulsed magnetic fields up to 54 T. The data reveal three basic frequencies F_a, F_b and F_{b - a}, which can be interpreted on the basis of three compensated closed orbits at low temperature. However a very weak thermal damping of the Fourier component F_b, with the highest amplitude, is evidenced for SdH spectra above about 6 K. As a result, magnetoresistance oscillations are observed at temperatures higher than 30 K. This feature, which is not observed for dHvA oscillations, is in line with quantum interference, pointing to a Fermi surface reconstruction in this compound.