Abstract
Spin-liquid behavior was recently suggested experimentally in the moderately one-dimensional organic compound . This compound can be modeled by the one-band Hubbard model on the anisotropic triangular lattice with , where is the minority hopping. It thus becomes important to extend previous studies, that were performed in the range , to find out whether there is a regime where Mott insulating behavior can be found without long-range magnetic order. To this end, we study the above model in the range using cluster dynamical mean-field theory (CDMFT). We argue that it is important to choose a symmetry-preserving cluster rather than a quasi-one-dimensional cluster. We find that, upon increasing beyond , the Mott transition at zero temperature is replaced by a first-order transition separating a metallic state from a collinear magnetic insulating state excluding the possibility to find a quantum spin liquid for the physically relevant value . The phase diagram obtained in this study can provide a working basis for moderately one-dimensional compounds on the anisotropic triangular lattice.
- Received 23 August 2016
- Revised 25 November 2016
DOI:https://doi.org/10.1103/PhysRevB.94.245133
©2016 American Physical Society