A superposition of the Pauli and orbital couplings of a high magnetic field to charge carriers in a charge-density-wave (CDW) system is proposed to give rise to transitions between subphases with quantized values of the CDW wave vector. By contrast to the purely orbital field-induced density-wave effects which require a strongly imperfect nesting of the Fermi surface, the new transitions can occur even if the Fermi surface is well nested at zero field. We suggest that such transitions are observed in the organic metal $\alpha -(\mathrm{BEDT}-\mathrm{TTF}{)}_2\mathrm{KHg}(\mathrm{SCN}{)}_4$ under a strongly tilted magnetic field.

The superconducting transition in the layered organic compound $\alpha \text{−}{\left(\mathrm{BEDT}\text{−}\mathrm{TTF}\right)}_2\mathrm{K}\mathrm{Hg}{\left(\mathrm{SCN}\right)}_4$ has been studied in the two hydrostatic pressure regimes where a charge-density wave is either present or completely suppressed. Within the charge-density-wave state the experimental results reveal a network of weakly coupled superconducting regions. This is especially seen in a strong enhancement of the measured critical field and the corresponding positive curvature of its temperature dependence. Further, it is shown that on lowering the pressure into the density-wave state traces of a superconducting phase already start to appear at a much higher temperature.

Organic salts represent an ideal experimental playground for studying the interplay between magnetic and charge degrees of freedom, which has culminated in the discovery of several spin-liquid candidates such as $\kappa \text{−}(\mathrm{ET}{)}_2{\mathrm{Cu}}_2(\mathrm{CN}{)}_3$ ($\kappa \text{−}\mathrm{Cu}$). Recent theoretical studies indicate the possibility of chiral spin liquids stabilized by ring exchange, but the parent states with chiral magnetic order have not been observed in this material family. In this Letter, we discuss the properties of the recently synthesized $\kappa \text{−}(\mathrm{BETS}{)}_2\mathrm{Mn}[\mathrm{N}(\mathrm{CN}{)}_2{]}_3$ ($\kappa \text{−}\mathrm{Mn}$). Based on analysis of specific heat, magnetic torque, and NMR measurements combined with ab initio calculations, we identify a spin-vortex crystal order. These observations definitively confirm the importance of ring exchange in these materials and support the proposed chiral spin-liquid scenario for triangular lattice organics.

For the first time the data on resistance anisotropy in the (ET)2TlHg(SCN)4 salt family are presented. The data are discussed taking into account the Fermi surface of the compounds. The pressure effect on the low-temperature phase transition in (ET)2TlHg(SCN)4 is investigated. It is found that pressures of about 3 kbar suppress the transition. The T-P phase diagram is plotted