Direct Observation of Effective Temperature of Ta Atom in Layer Compound TaS<sub>2</sub> by Neutron Resonance Absorption Spectrometer

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  • Tokuda Koji
    Department of Quantum Energy Engineering, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan
  • Kamiyama Takashi
    Department of Quantum Energy Engineering, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan
  • Kiyanagi Yoshiaki
    Department of Quantum Energy Engineering, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan
  • Moreh Raymond
    Department of Physics, Ben-Gurion University of the Negev, p.o.b. 653, Beer-Sheva 84105, Israel
  • Ikeda Susumu
    Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Oho 1-1, Tukuba, Ibaraki 305-0801, Japan

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  • Direct Observation of Effective Temperature of Ta Atom in Layer Compound TaS2 by Neutron Resonance Absorption Spectrometer.

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A neutron resonance absorption spectrometer, DOG, has been installed at KENS, High Energy Accelerator Research Organization Neutron Source, which enables us to investigate the motions of a particular element by analyzing the line width of resonance absorption spectrum. We measured the temperature dependence of the effective temperature of Ta motion in TaS2 as well as in Ta metal using DOG. The effective temperatures extracted from the observed absorption spectrum agree well with the calculated values from the phonon density of states of Ta metal over a wide temperature range of 10 to 300 K. We also succeeded in measuring both the angular dependence and the temperature dependence of effective temperatures of Ta in a layer compound TaS2. Based on the temperature dependence of the effective temperature, the partial phonon density of states of Ta in TaS2 was discussed.

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