Universal field-induced charge-density-wave phase diagram: theory versus experiment.

We suggest a theory of field-induced charge-density-wave phases, generated by high magnetic fields in quasi-low-dimensional conductors. We demonstrate that, in layered quasi-one-dimensional conductors, the corresponding critical magnetic field ratios are universal and do not depend on any fitting parameter. In particular, we find that H_{1}/H_{0} = 0.73, H_{2}/H_{0} = 0.59, H_{3}/H_{0} = 0.49, and H_{4}/H_{0} = 0.42, where H_{n} is a critical field of a phase transition between the field-induced charge-density-wave phases with numbers n and n + 1. The suggested theory is in very good qualitative and quantitative agreement with the existing experimental data in alpha-(ET)_{2}KHg(SCN)_{4} material.