Abstract
We report high-field magnetotransport measurements on β″-BEDT- TTF[(HO)M(CO)]C HN, where M=Ga, Cr or Fe . In spite of the differing M ions, these compounds have very similar Fermi surfaces. We observe four distinct Shubnikov-de Haas frequencies, corresponding to four Fermi-surface pockets; the frequencies exhibit the additive relationship expected for a compensated semimetal. The compounds show paramagnetic behaviour and no superconductivity down to 0.5 K, in contrast to other materials of the same family with different solvent molecules. © 2003 Elsevier B.V. All rights reserved.