engleski

Hall Effect in the Organic Conductor (TMTSF)_2NO_3

Hall effect measurements of the organic conductor (TMTSF)2NO3 at low temperatures (1.8 ≤ T ≤7 K) and high magnetic fields (H ≤ 8.5 T), are reported. The large Hall coefficient RH indicates the semimetallic nature of the spin density wave (SDW) ground state, whereas its positive sign shows the dominance of the hole carriers. Both RH and resistivity increase with decreasing temperature, which suggests the possibility that the carrier concentration is reduced as the temperature is lowered. The field variation of Hall resistance Rxy deviates from the linear dependence for T ≤ 4 K and H ≥ 3 T. This could be interpreted not only by the temperature induced change in the number of carriers or anisotropy of their mobilities, but also by the possibility that the SDW state might change with the applied magnetic field.

A. organic crystals ; D. electronic transport ; D. galvanomagnetic effects

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