Open AccessQuantum phase transition as a result of magnetic frustrations in a ferrimagnetic Heisenberg system
Author(s) -
Zhang Song-Jun,
Jianjun Jiang,
Yongjun Liu
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.531
Subject(s) - density matrix renormalization group , condensed matter physics , ferrimagnetism , antiferromagnetism , physics , frustration , heisenberg model , quantum phase transition , spin (aerodynamics) , ground state , phase transition , renormalization group , quantum mechanics , magnetic field , magnetization , thermodynamics
Using density-matrix renormalization group (DMRG) method, we studied the effect of magnetic frustrations due to next-nearest- neighbor bonds in a system of quasi-one-dimensional Heisenberg antiferromagnetic chain but with ferrimagnetic properties. In this paper, the ground state energy per unit cell, spin correlation function and spin gap are calculated. As a result of the frustrations, the quantum disordered phase with the spin gap appears at the spin order-disorder phase transition point αC≈0.412 to α1. And in the region of magnetic-order phase, the increasing magnetic frustrations reduce the magnetic order.