Indication for the coexistence of closed orbit and quantum interferometer with the same cross section in the organic metal (ET)4(H3O)[Fe(C2O4)3].C6H4Cl2: Persistence of SdH oscillations above 30 K

• Published in: The European physical journal. B, Condensed matter physics Condensed matter physics, 2009, Vol.71 (2)
• Main Authors: Vignolles, David, Audouard, Alain, N. Laukhin, Vladimir, Canadell, Enric, G. Prokhorova, Tatyana, B. Yagubskii, Eduard
• Format: Article
• Language: English
• Subjects: Condensed Matter; Physics; Strongly Correlated Electrons; Superconductivity
• ISSN: 1434-6028; 1434-6036
• DOI: 10.1140/epjb/e2009-00306-1

Shubnikov-de Haas (SdH) and de Haas-van Alphen (dHvA) oscillations spectra of the quasi-two dimensional charge transfer salt $\beta$''-(ET)$_4$(H$_3$O)[Fe(C$_2$O$_4$)$_3$]$\cdot$C$_6$H$_4$Cl$_2$ 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.