Spin Dynamics in Two-Dimensional Percolating Heisenberg Antiferromagnets
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概要
- 論文の詳細を見る
Inelastic netrtron-scattering experitaaents were perf'orut?ed on txvo-dizauensional Heisenberg antif'errornagnets, RbzNxIn.1VIg? .F.1, xx'ith the nnagnetic concentrations (c : 0.598 arnd 0.516) .jttstaloove and beloxv the percolatiora threshold (c. : 0.593 f'or the sqtrare l?tttice). Also, the l118gnetic response (,y"(q, [)) xvas investigated over 21 xvide tenaperattrre range. We observed an overdantnped )"(q, E), which W21S well fitted to 21 daranped laarnaonic-oscillator scattering f'tunction. AtIOXV tetaaperattnres, ,("(q, E) is dispersive srnd can be described by the predicted ['trnctional f'orzn of'f'racton excitations. As the teuaaperattrre increases, the q-dependence gra'tdtrally becotaaes weaker,and )("(q, H) alttaost beconaes independent of' q at tenaperattrres higher than 150 K. The incoher-ent character of .zz (q, E) art high teutaperattrres indicates that collectixve naotions do zuot exist dueto very Sl11.llL1l thertaaal correlation lengths. Frarctoua excitations exist only at low tetaaperattrres.
- 社団法人日本物理学会の論文
- 1998-10-15
著者
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池田 宏信
鹿児島大学工学部
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Ikeda Hiroaki
Department Of Medical Oncology Kkr Sapporo Medical Center
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ITOH Shinichi
Neutron Science Laboratory, Institute of Materials Structure Science, High Energy Accelerator Resear
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IKEDA Hironobu
Neutron Science Laboratory, Institute of Materials Structure Science, High Energy Accelerator Resear
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Yoshizawa Hideki
Neutron Scattering Laboratory, Institute for Solid State Physics, University of Tokyo
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Ikeda H
Department Of Science Kyoto University
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池田 宏信
高エネルギー研
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J. HARRIS
ISIS Facility,Rutherford Appleton Laboratory
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STEIGENBERGER Uschi
ISIS Facility,Rutherford Appleton Laboratory
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伊藤 晋一
KEK物構研
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Itoh S
Neutron Science Laboratory Institute Of Materials Structure Science High Energy Accelerator Research
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Ikeda Hironobu
Fukuoka Agricultural Research Center
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Ikeda Hironobu
Neutron Science Laboratory Institute Of Materials Structure Science High Energy Accelerator Research
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Ikeda Hiroaki
Fac. Of Medicine Mie Univ.
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Itoh Shinichi
Neutron Science Laboratory Institute Of Materials Structure Science High Energy Accelerator Research
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Yoshizawa Hideki
Neutron Scattering Laboratory Institute For Solid State Physics University Of Tokyo
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Akio Maeda
Faculty Of Engineering Kagoshima University
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Ikeda Hironobu
Neutron Science Laboratory High Energy Accelerator Research Organization (kek)
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Ikeda Hiroaki
Faculty Of Medicine Mie University
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Itoh Shinichi
Neutron Science Laboratory High Energy Accelerator Research Organization (kek)
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Steigenberger Uschi
Isis Facility Rutherford Appleton Laboratory
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J. Harris
Isis Facility Rutherford Appleton Laboratory
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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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