High Energy-Resolution Inelastic Neutron Scattering Experiments on Triplet Bound State Excitations in SrCu_2(BO_3)_2(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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In this letter we report on the high energy-resolution neutron scattering studies on the dynamic structure factor of the two-triplet bound states in the two-dimensional S=1/2 Shastry-Sutherland system, SrCu_2(BO_3)_2, in the energy transfer range of 4 to 7 meV. In contrast to the earlier interpretation of the low energy-resolution results, these bound state excitations show hardly any dispersion, but do show a strong wave-vector-dependent structure factor. Although these findings are in overall agreement with the recent theoretical calculation of the 2-triplon dynamic structure factor by Knetter and Uhrig [Phys. Rev. Lett. 92 (2004) 027204], they also show distinct differences, which may be due to some symmetry-breaking terms in the Hamiltonian that are not included in the theory, such as the interdimer Dzyaloshinski-Moriya interactions recently discovered in this compound.
- 社団法人日本物理学会の論文
- 2005-08-15
著者
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UEDA Yutaka
Institute for Solid State Physics, University of Tokyo
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Nishi Masakazu
Neutron Scattering Laboratory Issp University Of Tokyo
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Nishii M
Institute For Solid State Physics University Of Tokyo
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Nishi Masakazu
Univ. Tokyo Chiba Jpn
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KAKURAI Kazuhisa
Advanced Science Research Center, Japan Atomic Energy Research Institute (JAERI)
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KAKURAI Kazuhisa
Japan Atomic Energy Agency
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NUKUI Katsuyuki
Neutron Science Laboratory, Institute for Solid State Physics, The University of Tokyo
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ASO Naofumi
Neutron Science Laboratory, Institute for Solid State Physics, The University of Tokyo
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KADOWAKI Hiroaki
Department of Physics, Tokyo Metropolitan University
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KAGEYAMA Hiroshi
Graduate School of Science, Kyoto University
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Ueda Yutaka
Institute For Solid State Physics University Of Tokyo
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Nishi Masakazu
Neutron Scattering Laboratory I. S. S. P. University Of Tokyo
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Kodama Katsuaki
Department Of Physics Division Of Material Science Nagoya University
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Aso Naofumi
Neutron Scattering Laboratory Institute For Solid State Physics University Of Tokyo
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Kakurai Kazuhisa
Advanced Science Research Center Japan Atomic Energy Research Institute
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Nukui Katsuyuki
Neutron Science Laboratory Institute For Solid State Physics University Of Tokyo:(present Address)fu
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Kakurai K
Japan Atomic Energy Agency
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Kadowaki Hiroaki
Department Of Physics Graduate School Of Science Tokyo Metropolitan University
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Ueda Yutaka
Institute For Solid State Physic The University Of Tokyo
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Nukui Katsuyuki
Neutron Science Laboratory Institute For Solid State Physics The University Of Tokyo:(present Addres
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KAKURAI Kazuhisa
Advanced Science Research Center, Japan Atomic Energy Research Institute
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NISHI Masakazu
Neutron Science Laboratory, Institute for Solid State Physics, University of Tokyo
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Kageyama Hiroshi
Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
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NUKUI Katsuyuki
Neutron Science Laboratory, Institute for Solid State Physics, University of Tokyo:(Present address)Fuji Photo Film Co., Ltd.
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