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We study effect of inhomogeneities of the lattice in the S=1/2bond-alternating chain by using a quantum Monte Carlo method and an exactdiagonalization method. We adopt a defect in the alternating order as theinhomogeneity and we call it `bond impurity'. Local magnetic structures inducedby the bond impurities are investigated both in the ground state and at verylow temperatures. The local magnetic structure can be looked on as an effectiveS=1/2 spin and the weakness of the interaction between the local structurescauses the quasi-degenerate states in the low energy. We also investigate theforce acting between bond impurities and find that the force is generallyattractive. We also study the dynamical property of the local magneticstructure. While the local magnetic structure behaves as an isolated S=1/2 spinin the response to a time-dependent uniform field, it is found to be robustagainst the effect of a random noise applied at each site individually in thesweeping filed.Comment: 22 pages, 9 figures, other comment

physical review. b, condensed matter

Local magnetic structures induced by inhomogeneities of the lattice in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mfrac><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:mfrac></mml:math>bond-alternating chains and their response to a time-dependent magnetic field with noise

Local magnetic structures induced by inhomogeneities of the lattice inS=12bond-alternating chains and their response to a time-dependent magnetic field with noise