Effective Hamiltonian for the electronic properties of the quasi-one-dimensional material Li 0.9 Mo6 O17
Entity
UAM. Departamento de Física Teórica de la Materia CondensadaPublisher
The American Physical SocietyDate
2012-06-18Citation
10.1103/PhysRevB.85.235128
Physycal Review B 85.23 (2012): 235128
ISSN
1098-0121 (print); 1550-235X (online)DOI
10.1103/PhysRevB.85.235128Funded by
R.M. received financial support from an Australian Research Council Discovery Project Grant No. DP0877875. J. M. acknowledges financial support from the International Collaboration Agreement from Australian Research Council Discovery Project (DP10932249) [Chief Investigator: B.J. Powell] and Ministerio de Economía y Competitividad in Spain (MAT2011-22491)Editor's Version
http://dx.doi.org/10.1103/PhysRevB.85.235128Subjects
FísicaRights
© 2012 American Physical SocietyAbstract
The title material has a quasi-one-dimensional electronic structure and is of considerable interest because it has a metallic phase with properties different from a simple Fermi liquid, a poorly understood “insulating” phase, and a superconducting phase which may involve spin triplet Cooper pairs. Using the Slater-Koster approach and comparison with published band-structure calculations we present the simplest possible tight-binding model for the electronic band structure near the Fermi energy. This describes a set of ladders with weak (and frustrated) interladder hopping. In the corresponding lattice model the system is actually close to one-quarter filling (i.e., one electron per pair of sites) rather than half-filling, as has often been claimed.We consider the simplest possible effective Hamiltonian that may capture the subtle competition between unconventional superconducting, charge ordered, and non-Fermi liquid metal phases. We argue that this is an extended Hubbard model with long-range Coulomb interactions. Estimates of the relevant values of the parameters in the Hamiltonian are given. Nuclear magnetic resonance relaxation rate experiments should be performed to clarify the role of charge fluctuations in Li0.9Mo6O17 associated with the proximity to a Coulomb driven charge ordering transition
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Google Scholar:Merino Troncoso, Jaime
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McKenzie, Ross H.
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