Volume 34, Number 8, June II 1996
|Page(s)||599 - 604|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Unconventional magnetic field and pressure dependences of the ground state of the low-dimensional organic superconductor (BEDO-TTF)2ReO4.H2O
Laboratoire de Physique des Solides (ERS CNRS 111), Service National
des Champs Magnétiques Pulsés (UMS CNRS 819), INSA, Complexe
Rangueil - 31077 Toulouse, France
2 Laboratoire de Physique des Solides (URA CNRS 02), Université de Paris-Sud, 91405 Orsay Cédex, France
3 Institute of Chemical Physics in Chernogolovka, Russian Academy of Sciences, Chernogolovka, MD 142432, Russia
Magnetotransport experiments have been carried out in the two-dimensional organic metal (BEDO- at temperatures down to 0.4 K and under hydrostatic pressure up to 11 kbar. When measured in magnetic field of a few teslas, the magnetoresistance is large and a steep resistance rise is observed below 4 K, which, as is the case for quasi–one-dimensional TMTSF-based compounds, is the signature of a spin density wave condensation. As already observed at ambient pressure, two series of Shubnikov-de Haas oscillations, linked to hole and electron orbits, are evidenced in the applied pressure range from 3.5 to 11 kbar. Both hole and electron orbit oscillation frequencies (respectively noted Fh and Fe) increase strongly as the pressure increases , while their ratio remains unchanged . As the applied pressure increases, both cyclotron masses either slowly decrease or remain constant, keeping low values when compared to other 2D compounds.
PACS: 72.15.Gd – Galvanomagnetic and other magnetotransport effects / 74.70.Kn – Organic superconductors / 75.30.Fv – Spin-density waves
© EDP Sciences, 1996
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