The two-dimensional Hubbard model on the anisotropic triangular lattice, with two different hopping amplitudes t and t' , is relevant to describe the low-energy physics of kappa-(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'/ t= 0.85, suitable to describe the nonmagnetic compound with X = Cu_2(CN)_3 . On the contrary, Néel order takes place for weaker frustrations, i.e., t'/t~0.4–0.6, suitable for materials with X = Cu_2(SCN)_2 , Cu[N(CN)_2]Cl, or Cu[N(CN)_2]Br.

The two-dimensional Hubbard model on the anisotropic triangular lattice, with two different hopping amplitudes t and t('), is relevant to describe the low-energy physics of kappa-(ET)(2)X, 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(')/t=0.85, suitable to describe the nonmagnetic compound with X=Cu-2(CN)(3). On the contrary, Neacuteel order takes place for weaker frustrations, i.e., t(')/t similar to 0.4-0.6, suitable for materials with X=Cu-2(SCN)(2), Cu[N(CN)(2)]Cl, or Cu[N(CN)(2)]Br.

Spin-liquid and magnetic phases in the anisotropic triangular lattice: The case of kappa-(ET)(2)X / Tocchio, LUCA FAUSTO; Parola, A; Gros, C; Becca, F.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - ELETTRONICO. - 80:6(2009), pp. 064419-1-064419-6. [10.1103/PhysRevB.80.064419]

Spin-liquid and magnetic phases in the anisotropic triangular lattice: The case of kappa-(ET)(2)X

TOCCHIO, LUCA FAUSTO;
2009

Abstract

The two-dimensional Hubbard model on the anisotropic triangular lattice, with two different hopping amplitudes t and t('), is relevant to describe the low-energy physics of kappa-(ET)(2)X, 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(')/t=0.85, suitable to describe the nonmagnetic compound with X=Cu-2(CN)(3). On the contrary, Neacuteel order takes place for weaker frustrations, i.e., t(')/t similar to 0.4-0.6, suitable for materials with X=Cu-2(SCN)(2), Cu[N(CN)(2)]Cl, or Cu[N(CN)(2)]Br.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2669888
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