Abstract
We investigate ground-state properties and quantum phase transitions in the one-dimensional spin-orbital model relevant to cubic vanadates. Using the density-matrix renormalization group, we compute the ground-state energy, the magnetization, and the correlation functions for different values of the Hund’s coupling and the external magnetic field. It is found that the magnetization jumps at a certain critical field, which is a hallmark of the field-induced first-order phase transition. The phase transition driven by is also of first order. We also consider how the lattice-induced ferro-type interaction between orbitals modifies the phase diagram, and discuss the results in a context of the first-order phase transition observed in at 77 K.
- Received 7 October 2003
DOI:https://doi.org/10.1103/PhysRevB.69.104425
©2004 American Physical Society