ESR Study on the Excited State Energy Spectrum of SrCu_2(BO_3)_2 : A Central Role of Multiple-Triplet Bound States(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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The excited state energy spectrum of a two-dimensional dimer system SrCu_2(BO_3)_2 has been investigated by high field ESR. Besides two non-degenerated one-triplet excitations, various types of multiple-triplet bound states are identified: singlet, triplet, and quintet. The intensity of these bound states is extremely strong because one-triplet process is strongly suppressed in the orthogonal dimer system. The bound singlet state is found slightly below the energy gap of the one-triplet state, indicating the proximity to a quantum critical point. A band of the two-triplet bound state splits due to distant neighbor interactions. The bound quintet state is the direct evidence of two-triplet object made up of four S = 1/2 spins. The energy of the lowest quintet becomes lower than that of the one-triplet excitation before the closing of the lowest spin gap, namely, the quintet touches first to the ground singlet state. The present investigation exhibits an essential role of multiple-triplet bound states in the magnetic excitation spectrum.
- 社団法人日本物理学会の論文
- 2003-12-15
著者
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UEDA Yutaka
Institute for Solid State Physics, University of Tokyo
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MOTOKAWA Mitsuhiro
Institute for Materials Research, Tohoku University
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KAGEYAMA Hiroshi
Institute for Solid State Physics, The University of Tokyo
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Ueda Yutaka
Institute For Solid State Physics University Of Tokyo
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NOJIRI Hiroyuki
Department of Physics, Okayama University
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Kageyama Hiroshi
Institute For Solid State Physics University Of Tokyo
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Ueda Yutaka
Issp University Of Tokyo
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Nojiri Hiroyuki
Department Of Gerontology Kanazawa Medical University
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MOTOKAWA Mitsuhiro
Department of Physics,Faculty of Science,Kobe University
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Motokawa M
Tohoku Univ. Sendai
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Motokawa M
Institute For Materials Research Tohoku University
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Motokawa Mitsuhiro
Tohoku Univ. Sendai Jpn
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Motokawa Mitsuhiro
Department Of Mechanical Engineering Faculty Of Engineering And Resource Science Akita University
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Motokawa Mitsuhiro
Institute For Materials Research Tohoku University
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Motokawa Mitsuhiro
Crest Japan Science And Technology:institute For Material Research Tohoku University
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Motokawa Mitsuhiro
Faculty Of Science Kobe University
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Mino M
Okayama Univ. Okayama
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Masuzawa Masahiro
Department Of Applied Physics Faculty Of Engineering Tohoku University
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Ueda Yutaka
Institute For Solid State Physic The University Of Tokyo
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MOTOKAWA Mitsuhiro
Department of Physics, Kobe University
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Kageyama Hiroshi
Institute for Integrated Cell-Material Sciences, Kyoto University, Kyoto 606-8501, Japan
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