SPIN-DENSITY-WAVE TRANSITION AND RESISTIVITY MINIMUM OF THE BECHGAARDSALT (TMTSF)(2)NO3 AT HIGH MAGNETIC-FIELD, WHERE TMTSF IS TETRAMETHYLTETRASELENAFULVALENE

Transverse magnetoresistance of the Bechgaard salt (tetramethyltetrase lenafulvalene)(2)NO3 has been measured up to 36 T, with the magnetic f ield parallel to the lowest conductivity direction c. Data have been recorded at ambient pressure, in the temperature range from 2 to 77 K. Whereas the anion ordering temperature remains field independent, the spin-density-wave transition temperature (T-SDW) increases by few ten ths of a percent at 32 T and the temperature at which the resistivity minimum occurs (T-min) increases by nearly a factor of 3 at 36 T The f ield dependence of T-SDW is studied in the framework of the mean-field calculations of Bjelis and Maki [Phys. Rev. B 45, 12 887 (1992)] whil e the T-min variation is discussed on the basis of field-induced elect ron confinement.