Abstract
The authors have measured the specific heat of the quasione-dimensional organic conductor (TMTSF)2ClO4 between 0.4 and 2K in magnetic fields (H<or approximately=63 kOe) parallel to c* (the high-magnetoresistance direction). The field strongly affects the electronic contribution gamma T and their results show that two competing mechanisms are involved. Increasing the field yields first an increase of gamma which is very probably related to the vanishing of the superconducting pseudogap; it is followed by a decrease of gamma which announces and anticipates the condensation of the zero- gamma ground state. They identify this state as a SDW state like the one observed in (TMTSF)2PF6 at low pressures. They propose a phase diagram which includes the magnetic field effect and can be generalised to the other compounds of the same family.
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