Spin-density-wave transition and resistivity minimum of the Bechgaard salt (TMTSF)2NO3at high magnetic field, where TMTSF is tetramethyltetraselenafulvalene

Abstract

Transverse magnetoresistance of the Bechgaard salt (tetramethyltetraselenafulvalene${)}_2$ ${\mathrm{NO}}_3$ has been measured up to 36 T, with the magnetic field parallel to the lowest conductivity direction ${\mathit{c}}^{\mathrm{*}}$. 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 (${\mathit{T}}_{\mathrm{SDW}}$) increases by few tenths of a percent at 32 T and the temperature at which the resistivity minimum occurs (${\mathit{T}}_{\min }$) increases by nearly a factor of 3 at 36 T. The field dependence of ${\mathit{T}}_{\mathrm{SDW}}$ is studied in the framework of the mean-field calculations of Bjelis and Maki [Phys. Rev. B 45, 12 887 (1992)] while the ${\mathit{T}}_{\min }$ variation is discussed on the basis of field-induced electron confinement.