Magnetic and transport properties of a one dimensional frustrated t-J model for vanadate nanotubes

Abstract

We propose a one-dimensional model consisting of a chain with a t-J Hamiltonian coupled to a Heisenberg chain in a frustrated geometry to describe the appearance of the ferromagnetic phase which has been experimentally observed in vanadate nanotubes. This model contains a mechanism of frustration suppressed by doping suggested by L. Krusin-Elbaum, et al. [Nature 431, 672 (2004)]. We study, using numerical techniques in small clusters, the relation between magnetic order and transport properties in the proposed model, and we perform a detailed comparison of the physical properties of this model with those of the ferromagnetic Kondo lattice model. For this comparison, a number of results for the latter model, obtained using the same numerical techniques, will be provided to complement those results already available in the literature. We conclude that it does not appear to be a true ferromagnetic order in the proposed model, but rather an incommensurate ferrimagnetic one, and contrary to what happens in the ferromagnetic Kondo lattice model, electronic transport is somewhat suppressed by this ferrimagnetic order.

arXiv comment9 pages, 10 eps figures; final version to appear in Physical Review B

References in corpus (18)

• The density-matrix renormalization group
• Correlated Electrons in High Temperature Superconductors
• NRG study of the Kondo effect in the presence of itinerant-electron ferromagnetism
• Temperature Dependence of the Conductivity in (La,Sr)MnO${}_3$
• Static and Dynamical Properties of the Ferromagnetic Kondo Model with Direct Antiferromagnetic Coupling Between the localized $t_{2g}$ Electrons
• Ferromagnetism in Electronic Models for Manganites
• Unveiling New Magnetic Phases of Undoped and Doped Manganites
• Gate-Defined Quantum Dots on Carbon Nanotubes
• Optical conductivity of colossal magnetorestistance compounds: Role of orbital degeneracy in the ferromagnetic phase
• Electronic Correlations in Manganites
• New Type of Charge and Magnetic order in the Ferromagnetic Kondo Lattice
• Magnetic properties of vanadium-oxide nanotubes probed by static magnetization and {51}V NMR
• Spin order in the one-dimensional Kondo and Hund lattices
• An overview on the phase diagram of the frustrated two-leg ladder model
• The Kondo lattice model with correlated conduction electrons
• Magnetic phase diagram of the Kondo lattice model with quantum localized spins
• Quantum dot with ferromagnetic leads: a density-matrix renormalization group study
• Spin Dependent Transport in Magnetic Nanostructures