Quantum Phase Transition in Coupled Spin Ladders

Abstract

The ground state of an array of coupled, spin-half, antiferromagnetic ladders is studied using spin-wave theory, exact diagonalization (up to 36 sites) and quantum Monte Carlo techniques (up to 256 sites). Our results clearly indicate the occurrence of a zero-temperature phase transition between a Néel ordered and a non-magnetic phase at a finite value of the inter-ladder coupling (${\alpha }_c\simeq 0.3$). This transition is marked by remarkable changes in the structure of the excitation spectrum.

4 pages, 6 postscript figures, to appear in Physical Review B

References in corpus (2)

• Resonating Valence Bond Wave Functions for Strongly Frustrated Spin Systems
• Quantum Effects and Broken Symmetries in Frustrated Antiferromagnets

Cited by in corpus (5)

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• The unusual electronic structure of the "pseudo-ladder" compound CaCu2O3
• Theoretical constraints for the magnetic-dimer transition in two-dimensional spin models
• Square-lattice s=1/2 XY model and the Jordan-Wigner fermions: The ground-state and thermodynamic properties
• Optimization of infinite projected entangled pair states: The role of multiplets and their breaking