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Physica C Superconductivity

Higher order perturbation theory for anisotropic pairings in repulsive Hubbard model

Takuji Nomura, Kōsaku Yamada

Published Apr 9, 2004• 0 citations
Publisher
DOI
10.1016/j.physc.2004.02.090

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Low-energy states of the Hubbard model with infinite electron repulsion on an anisotropic triangular strip-type lattice formed by weakly interacting linear segments are studied. The estimates of the stability region boundaries for the ferromagnetic ground state of the lattice are obtained in first order perturbation theory in the interaction between the segments. It is shown that a magnetic transition accompanied by a jumpwise variation of the total spin of the ground state from the minimum to the maximum value is possible for lattices with cyclic boundary conditions and the number of electrons greater than the number of segments by unity.