Orbital effect of a magnetic field on the low-temperature state in the organic metalα−(BEDT−TTF)2KHg(SCN)4

Abstract

The effect of pressure on the $B-T$ phase diagram of $\alpha -(\mathrm{BEDT}-\mathrm{TTF}{)}_2\mathrm{KHg}(\mathrm{SCN}{)}_4$ is studied. The measured phase lines can be well described by a recent model of a charge-density wave system with varying nesting conditions. A remarkable increase of the transition temperature with magnetic field is found in a certain pressure and field range. We associate this result with a dramatic enhancement of the orbital effect of magnetic field due to a deterioration of the nesting conditions by pressure. Furthermore, we present data which can be interpreted as a first sign of field-induced charge-density waves.