Abstract
The longitudinal magnetoresistance of the unusual Bechgaard salt,(TMTSF)2FSO3,has been studied up to 33 T under various pressures. In this compound, a singleseries of the Shubnikov–de Haas (SdH) oscillation is very pronounced for pressuresbetween 5.2 and 11.8 kbar where the zero-field ground state is superconducting.Unlike the case of the rapid oscillations in most Bechgaard salts, the temperatureand magnetic field dependence of the oscillations is in good agreement with theLifshitz–Kosevich formula, implying the two-dimensional closed orbital motion of theelectrons. The effective mass of the electrons and Dingle temperature are estimated as1.4 ± 0.05 m0 and 1.6–2.4 K, respectively. For an origin of the closed orbits, it is suggested thatincomplete nesting between open Fermi surfaces is induced by pressure. Discontinuouschange of the frequency, amplitude, and Dingle temperature of the oscillations around9 kbar indicates that the electronic state below and above this pressure is different.According to the features of the SdH oscillations along with the phase diagram of(TMTSF)2FSO3,the pressure dependence is divided into three regions.
Published Version
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