Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-12-12
Physics
Condensed Matter
Strongly Correlated Electrons
REVTEX file, 9 pages, 1 Table, 9 eps Figures. Accepted in PRB
Scientific paper
10.1103/PhysRevB.63.054432
We apply the Lanczos method to a 2-leg ladder with mixed spins of magnitudes $(S_1,S_2)=(1,1/2)$ located at alternating positions along the ladder. The effect of dimerization $\gamma$ is also considered according to two different patterns. A Spin Wave Theory (SWT) is applied to this model predicting one gapless branch with ferromagnetic properties and another gapful branch with antiferromagnetic nature as low energy excitations of the model. We compute the ground state energies, Ferro- and AF-excitation gaps, magnetizations and correlation functions as a function of $J'$ and $\gamma$ which results into a fine estimate of the phase diagram. The Lanczos results are compared with the SWT analysis and a qualitative agreement is found but with numerical discrepancies. We also study numerically the Spin-Peierls instability and find that it is conditional for any value of $ J' \in (0, 2)$ and both dimerization patterns.
Langari A.
Martin-Delgado Miguel Angel
No associations
LandOfFree
Low Energy Properties of Ferrimagnetic 2-leg Ladders: a Lanczos study does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Low Energy Properties of Ferrimagnetic 2-leg Ladders: a Lanczos study, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low Energy Properties of Ferrimagnetic 2-leg Ladders: a Lanczos study will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-257616