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Quantum critical magnetization behaviors of kagome‐ and triangular‐lattice antiferromagnets
Author(s) -
Sakai Toru,
Nakano Hiroki
Publication year - 2013
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201200763
Subject(s) - magnetization , condensed matter physics , hexagonal lattice , lattice (music) , physics , quantum mechanics , magnetic field , antiferromagnetism , acoustics
Our previous numerical diagonalization study on the magnetization processes of the kagome‐ and triangular‐lattice antiferromagnets revealed that the former system exhibits a new field‐induced phenomenon, called a magnetization ramp, at 1/3 of the saturation magnetization, while the latter one a conventional magnetization plateau. To clarify the difference between the magnetization ramp and plateau, we consider a generalized lattice model with two exchange interactions J 1 and J 2 , which corresponds to the kagome lattice for J 2 = 0 and triangular one for J 2 = J 1 . The present numerical diagonalization study revealed that a quantum phase transition between the magnetization ramp and plateau occurs about J 2 / J 1 ∼ 0.1.