We study the competition between magnetic and spin-liquid phases in the Hubbard model on the anisotropic triangular lattice, which is described by two hopping parameters t and t' in different spatial directions and is relevant for layered organic charge-transfer salts. By using a variational approach that includes spiral magnetic order, we provide solid evidence that a spin-liquid phase is stabilized in the strongly correlated regime and close to the isotropic limit t'/t = 1. Otherwise, a magnetically ordered spiral state is found, connecting the (collinear) Néel and the (coplanar) 120-degree phases. The pitch vector of the spiral phase obtained from the unrestricted Hartree-Fock approximation is substantially renormalized in the presence of electronic correlations, and the Néel phase is stabilized in a wide regime of the phase diagram, i.e., for t'/t < 0.75. We discuss these results in the context of organic charge-transfer salts.

We study the competition between magnetic and spin-liquid phases in the Hubbard model on the anisotropic triangular lattice, which is described by two hopping parameters t and t' in different spatial directions and is relevant for layered organic charge-transfer salts. By using a variational approach that includes spiral magnetic order, we provide solid evidence that a spin-liquid phase is stabilized in the strongly correlated regime and close to the isotropic limit t'/t = 1. Otherwise, amagnetically ordered spiral state is found, connecting the (collinear) Neel and the (coplanar) 120 degrees phases. The pitch vector of the spiral phase obtained from the unrestricted Hartree-Fock approximation is substantially renormalized in the presence of electronic correlations, and the Neel phase is stabilized in a wide regime of the phase diagram, i.e., for t'/t < 0.75. We discuss these results in the context of organic charge-transfer salts. DOI: 10.1103/PhysRevB.87.035143

Spin-liquid versus spiral-order phases in the anisotropic triangular lattice / Tocchio, LUCA FAUSTO; Feldner, H; Becca, F; Valenti, R; Gros, C.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - ELETTRONICO. - 87:3(2013), pp. 035143-1-035143-5. [10.1103/PhysRevB.87.035143]

Spin-liquid versus spiral-order phases in the anisotropic triangular lattice

TOCCHIO, LUCA FAUSTO;
2013

Abstract

We study the competition between magnetic and spin-liquid phases in the Hubbard model on the anisotropic triangular lattice, which is described by two hopping parameters t and t' in different spatial directions and is relevant for layered organic charge-transfer salts. By using a variational approach that includes spiral magnetic order, we provide solid evidence that a spin-liquid phase is stabilized in the strongly correlated regime and close to the isotropic limit t'/t = 1. Otherwise, amagnetically ordered spiral state is found, connecting the (collinear) Neel and the (coplanar) 120 degrees phases. The pitch vector of the spiral phase obtained from the unrestricted Hartree-Fock approximation is substantially renormalized in the presence of electronic correlations, and the Neel phase is stabilized in a wide regime of the phase diagram, i.e., for t'/t < 0.75. We discuss these results in the context of organic charge-transfer salts. DOI: 10.1103/PhysRevB.87.035143
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2669890
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