Dynamics of weakly coupled random antiferromagnetic quantum spin chains

Abstract

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 Neel 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 quasi-one-dimensional disordered spin systems such as doped CuGeO${}_3$

4 pages

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Cited by in corpus (6)

• Strong disorder RG approach of random systems
• Distribution of NMR relaxations in a random Heisenberg chain
• Dynamical properties of the $S=\frac{1}{2}$ random Heisenberg chain
• Impact of strong disorder on the static magnetic properties of the spin-chain compound BaCu2SiGeO7
• Antiferromagnetic order in weakly coupled random spin chains
• Dynamical properties of the Haldane chain with bond disorder