Possible AF order in F-AF random alternating Heisenberg chain

研究成果: Article査読

3 被引用数 (Scopus)


The S = 1/2 ferromagnetic (F) - antiferromagnetic (AF) random alternating Heisenberg quantum spin chain is investigated by the quantum Monte Carlo method. The randomness is only present on the strong bonds taking values of ±2J randomly, and the weak bonds are uniformly antiferromagnetic with J. The model corresponds to the quasi one-dimensional compound, (CH3)2CHNH3Cu(Clx, Br1-x)3, whose ground state interpolates the Haldane state of the F-AF alternating spin chain at x = 1 and the singlet-dimer state of the AF-AF alternating spin chain at x = 0. The nonequilibrium relaxation function of the staggered magnetic susceptibility exhibits algebraic divergence in the intermediate region of 0.44 < x < 0.87, which explains the experimental observation of the magnetic phase transition. The results suggest that the antiferromagnetic order becomes critical by the randomness of the bond distributions even in the presence of the rich ferromagnetic bonds.

ジャーナルProgress of Theoretical Physics
145 SUPPL.
出版ステータスPublished - 2002

ASJC Scopus subject areas

  • 物理学および天文学(その他)


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