The ground state of an array of coupled, spin-1/2 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 Neel ordered and a nonmagnetic phase at a finite value of the interladder coupling (a(c)similar or equal to0.3). This transition is marked by remarkable changes in the structure of the excitation spectrum.

Quantum phase transition in coupled spin ladders

BECCA F
2002-01-01

Abstract

The ground state of an array of coupled, spin-1/2 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 Neel ordered and a nonmagnetic phase at a finite value of the interladder coupling (a(c)similar or equal to0.3). This transition is marked by remarkable changes in the structure of the excitation spectrum.
2002
Pubblicato
http://link.aps.org/doi/10.1103/PhysRevB.65.092406
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2939813
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