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Onishi, Hiroaki; Miyashita, Seiji*
Physica B; Condensed Matter, 329-333(2), p.874 - 875, 2003/05
Times Cited Count：0 Percentile：0(Physics, Condensed Matter)We investigate a one-dimensional 
antiferromagnetic Heisenberg model coupled to quantum lattice vibration by a quantum Monte Carlo method. For heavy mass, the lattice fluctuation can be regarded to be adiabatic and the system dimerizes at low temperature. On the other hand, for light mass, the lattice takes a uniform configuration on the thermal average and magnetic properties coincide with those of the uniform lattice system. These phenomena can be understood from the difference of the time scale of the motion between the spin and the lattice.
Onishi, Hiroaki; Miyashita, Seiji*
Journal of the Physical Society of Japan, 72(2), p.392 - 398, 2003/02
Times Cited Count：5 Percentile：38.82(Physics, Multidisciplinary)We investigate a one-dimensional antiferromagnetic Heisenberg model coupled to quantum lattice vibration using a quantum Monte Carlo method. We study the ground-state lattice fluctuation where the system shows a characteristic structure factor. We also study the mass dependence of magnetic properties such as the magnetic susceptibility and the magnetic excitation spectrum. For heavy mass, the system shows the same behavior as the case of classical lattice vibration. On the other hand, for light mass, magnetic properties coincide with those of the static uniform chain. We investigate the physical mechanism of this behavior and propose the picture of quantum narrowing.
