Quantum Renormalization Effect in One-Dimensional Heisenberg Antiferromagnets
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概要
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The dispersion relations of the lowest magnetic excitations at low temperatures and the temperature dependence of the inverse magnetic correlation length were determined using inelastic pulsed neutron scattering experiments on the following one-dimensional Heisenberg antiferromagnets: CsVCl3 (S = 3/2), CsVBr3 (S = 3/2), CsCrCl3 (S = 2), and CsNiCl3 (S = 1). From studying the exchange constant, J, it has been found that the observed energies of the magnetic excitations require a quantum renormalization factor that is dependent on the spin quantum number, S. The values of J were determined from the temperature dependence of the inverse magnetic correlation length, which describes the static correlation function that can be deduced from the energy-integrated dynamical structure factor. We demonstrated that the S-dependent quantum renormalization effect was detected by only inelastic pulsed neutron scattering experiments, and that the effect was consistent with quantum Monte Carlo calculations.
- 2012-08-15
著者
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Itoh Shinichi
Neutron Science Laboratory High Energy Accelerator Research Organization (kek)
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Tanaka Hidekazu
Department Of Chemistry And Chemical Biology Gunma University
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Kawana Daichi
Condensed Matter Research Center, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
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Yano Shin-ichiro
Graduate School of Science and Engineering, Aoyama Gakuin University, Sagamihara 252-5258, Japan
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Endoh Yasuo
Neutron Science Division, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
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Yokoo Tetsuya
Neutron Science Division, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
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Itoh Shinichi
Neutron Science Division, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
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