Soliton phase near antiferromagnetic quantum critical point in Q1D conductors

TL;DR

This paper models the phase transitions in Q1D conductors near an antiferromagnetic quantum critical point, revealing a soliton phase with a periodic domain structure and its relation to superconductivity.

Contribution

It introduces a nesting model describing the soliton phase and phase transitions in Q1D conductors near the antiferromagnetic quantum critical point.

Findings

Identification of a soliton phase with periodic domain structure.

Existence of a second-order transition line between soliton and SDW phases.

Agreement with experimental phase diagram of (TMTSF)$_2$PF$_6$.

Abstract

In the frameworks of a nesting model for Q1D organic conductor at the antiferromagnetic (SDW) quantum critical point the first-order transition separates metallic state from the soliton phase having the periodic domain structure. The low temperature phase diagram also displays the 2nd-order transition line between the soliton and the uniformly gapped SDW phases. The results agree with the phase diagram of (TMTSF)$_2$PF$_6$ near critical pressure [T. Vuletic et al., Eur. Phys. J. B 25, 319 (2002)]. Detection of the 2nd-order transition line is discussed. We comment on superconductivity at lowest temperature.