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

David Vignolles (1) , Alain Audouard (1) , Vladimir N. Laukhin (2, 3) , Enric Canadell (2) , Tatyana G. Prokhorova (4) , Eduard B. Yagubskii (4)

1 LNCMI-T - Laboratoire national des champs magnétiques intenses - Toulouse
2 ICMAB - Institut de Ciència de Materials de Barcelona
3 ICREA - Institució Catalana de Recerca i Estudis Avançats = Catalan Institution for Research and Advanced Studies
4 IPCP - Institute of Problems of Chemical Physics

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.

Domaines: Electrons fortement corrélés [cond-mat.str-el]; Supraconductivité [cond-mat.supr-con]

David Vignolles, Alain Audouard, Vladimir N. Laukhin, Enric Canadell, Tatyana G. Prokhorova, et al.. 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. The European Physical Journal B: Condensed Matter and Complex Systems, 2009, 71 (2), pp.203. ⟨10.1140/epjb/e2009-00306-1⟩. ⟨hal-00406520v2⟩