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Magnetism and superconductivity of strongly correlated electrons on the triangular lattice | | Cédric Weber
; Andreas Laeuchli
; Frédéric Mila
; Thierry Giamarchi
; | | Date: |
20 Sep 2005 | | Subject: | Superconductivity; Strongly Correlated Electrons | cond-mat.supr-con cond-mat.str-el | | Abstract: | We investigate the phase diagram of the j Model on a triangular lattice using a Variational Monte-Carlo approach. We use an extended set of Gutzwiller projected fermionic trial wave-functions allowing for simultaneous magnetic and superconducting order parameters. We obtain energies at zero doping for the spin-1/2 Heisenberg model in very good agreement with the best estimates. Upon electron doping (with a hopping integral $t<0$) this phase is surprisingly stable variationally up to $napprox 1.4$, while the $d_{x^{2}-y^{2}}+i d_{xy}$ order parameter is rather weak and disappears at $napprox 1.1$. For hole doping however the coplanar magnetic state is almost immediately destroyed and $d_{x^{2}-y^{2}}+i d_{xy}$ superconductivity survives down to $napprox 0.8$. For lower $n$, between 0.2 and 0.8, we find saturated ferromagnetism. Moreover, there is evidence for a narrow spin density wave phase around $napprox 0.8$. Commensurate flux phases were also considered, but these turned out {em not} to be competitive at finite doping. | | Source: | arXiv, cond-mat/0509520 | | Services: | Forum | Review | PDF | Favorites | |
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