Dynamical Properties of Protons in KH_2PO_4 Studied by Incoherent Neutron Scattering

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概要

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• Neutron incoherent scattering experiments covering wide energy-momentum space were carried out by utilizing both pulsed neutron source and steady neutron source, in order to elucidate the dynamical properties of the protons in KDP(KH_2PO_4). In the paraelectric phase, no inelastic peaks corresponding to the excitation of the proton tunneling mode was observed within the limit of the instrumental resolution. Instead, strong quasi-elastic scattering was observed extending in a wide energy-momentum space. The experimental results are analyzed consistently based on the 'order-disorder' model throughout T_c. However, in order to get reasonable fit for the energy spectra in the paraelectric phase, we have to assume an extraordinary value for the relaxation time of the proton hopping motion as 3×10^<-13> sec, which is of the order of the inverse of the averaged phonon frequency.

• 社団法人日本物理学会の論文
• 1994-03-15

著者

• IKEDA Susumu

  National Laboratory for High Energy Physics

• Yamada Y

  Waseda Univ. Tokyo

• YAMADA Yasusada

  Advanced Research Center for Science and Engineering,Waseda University

• Noda Yukio

  Department of Physics, Faculty of Science, Chiba University

• Yamada Yasusada

  Advanced Institute Of Science And Engineering Waseda University

• Sugimoto Hidehiko

  Department of Physics, Faculty of Science and Engineering, Chuo University

• Noda Yukio

  Department Of Physics Faculty Of Science Chiba University

• Sugimoto Hidehiko

  Department Of Electrical And Electronics Engineering Fukui University

• Ikeda Susumu

  National Laboratory For Hegh Energy Physics

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