Magnetic Excitations of Coupled Spin Ladders: a Quantum Monte Carlo Study

Details Magnetic Excitations of Coupled Spin Ladders: a Quantum Monte Carlo Study Magnetic Excitations of Coupled Spin Ladders: a Quantum Monte Carlo Study

2006-08-10

arxiv.org/abs/cond-mat/0608251v2

Phys. Rev. B 75, 012506 (2007)

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures (fig. 5 replaced)

Scientific paper

We calculate the magnetic excitation spectrum in the stripe phase of high-T_c materials. The stripes are modeled as coupled spin-1/2 ladders and the spin dynamics is extracted using Quantum Monte Carlo (QMC) simulations, which can capture the strong quantum fluctuations near quantum critical points of coupled spin ladders. We find a characteristic hourglass magnetic excitation spectrum with high-energy peaks rotated by 45 degrees compared to the incommensurate low-energy peaks in good agreement with the experimental data. The excitations are investigated quantitatively as a function of interladder coupling, ladder width, and domain formation with stripe disorder.

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