2005/02/28 by Eddy Yusuf, Kun Yang
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum many-body systems #Theoretical and Computational Physics #cond-mat.dis-nn
paper · pdf · doi:10.1103/physrevb.72.020403
published as Phys. Rev. B 72, 020403(R) (2005) · 4 pages
openalex publication_date 2005/07/15 · arxiv created 2005/07/18 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study the low-energy collective excitations and dynamical response functions of weakly coupled random antiferromagnetic spin-1∕2 chains. The interchain coupling leads to N'eel order at low temperatures. We use the real-space renormalization-group technique to tackle the intrachain couplings and treat the interchain couplings within the random phase approximation (RPA). We show that the system supports collective spin wave excitations, and calculate the spin wave velocity and spectra weight within RPA. Comparisons will be made with inelastic neutron scattering experiments on quasi-one-dimensional disordered spin systems such as doped CuGeO3.