2009/06/30 by Luca F. Tocchio, Alberto Parola, Claudius Gros +1
Chemistry · Materials Science · Mathematics · Physics and Astronomy · #Anisotropy #Antiferromagnetism #Chemistry #Combinatorics #Condensed matter physics #Crystallography #Energy (signal processing) #Hexagonal lattice #Lattice (music) #Magnetism in coordination complexes #Mathematics #Order (exchange) #Organic and Molecular Conductors Research #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.80.064419
7 pages, Physical Review B 80, 064419 (2009)
openalex publication_date 2009/08/26 · arxiv created 2009/09/04 · arxiv updated 2015/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The two-dimensional Hubbard model on the anisotropic triangular lattice, with two different hopping amplitudes t and t^\ensuremath', is relevant to describe the low-energy physics of \ensuremathκ\text\ensuremath-(ET)2X, a family of organic salts. The ground-state properties of this model are studied by using Monte Carlo techniques, on the basis of a recent definition of backflow correlations for strongly correlated lattice systems. The results show that there is no magnetic order for reasonably large values of the electron-electron interaction U and frustrating ratio t^\ensuremath'/t=0.85, suitable to describe the nonmagnetic compound with X=Cu2(CN)3. On the contrary, N'eel order takes place for weaker frustrations, i.e., t^\ensuremath'/t\ensuremath∼0.4--0.6, suitable for materials with X=Cu2(SCN)2, Cu[N(CN)2]Cl, or Cu[N(CN)2]Br.