Li Induced Spin and Charge Excitations in a Spin Ladder
arXiv:cond-mat/0108099 · doi:10.1103/PhysRevLett.88.257201
Abstract
A lithium dopant in a cuprate spin ladder acts as a vacant (non-magnetic) site accompanied by an extra hole bound by a Coulomb potential. We find that, although the undoped ladder spin gap is not essentially altered by Li doping, a dopant-magnon bound state appears within the gap. Contrary to the case of Zn-doped ladders, we predict that, in the Li-doped ladder, the spin liquid character is very robust against antiferromagnetism. We also predict the spatial dependence of the density of states in the vicinity of the dopant which could be measured by local spectroscopic probes.
4 pages, Submitted to Physical Review Letters
References in corpus (15)
- Surprises on the Way from 1D to 2D Quantum Magnets: the Novel Ladder Materials
- Equivalence of the antiferromagnetic Heisenberg ladder to a single chain
- Spinless impurities in high Tc cuprates: Kondo-like behavior
- Resonant Impurity Scattering in a Strongly Correlated Electron Model
- Low-Temperature Properties of the Randomly Depleted Heisenberg Ladder
- Persistence of Li Induced Kondo Moments in the Superconducting State of Cuprates
- Rapid Suppression of the Spin Gap in Zn-doped CuGeO_3 and SrCu_2O_3
- Impurity Effect on Spin Ladder System
- Spin and Charge Texture around In-Plane Charge Centers in the CuO_2 planes
- Spin ladders with nonmagnetic impurities
- Effects of Nonmagnetic Impurity Doping on Spin Ladder System
- Dynamics of the Local Moment Induced by Nonmagnetic Defects in Cuprates
- Evolution of the Spin Gap Upon Doping a 2-Leg Ladder
- Susceptibilities of Sr(Cu_(1-x)Zn_x)_2O_3 Studied by Quantum Monte Carlo Simulation
- Pair breaking by impurities in the two-dimensional t-J model