Development of High-Pressure Technique for Single-Crystal Magnetic Neutron Diffraction under 10 GPa

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  • Osakabe Toyotaka
    Neutron Materials Research Center, Quantum Beam Science Directorate, Japan Atomic Energy Agency

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  • 10 GPa級単結晶中性子磁気回折を目指した高圧力技術の開発
  • 10GPaキュウ タンケッショウ チュウセイシ ジキ カイセツ オ メザシタ コウアツリョク ギジュツ ノ カイハツ

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A hybrid-anvil device was newly developed for high-pressure single-crystal magnetic neutron diffraction experiments up to 10 GPa. The device is composed of a large sapphire anvil and a tungsten carbide (WC) anvil that has a hollow in the center of the culet. In a feasibility test of the device, the maximum pressure of 7 GPa was generated with high stability. The hydrostaticity of pressure-transmitting media, which is essential for the single-crystal diffraction experiments, was investigated by evaluating the mosaic spread of NaCl single crystals under pressure. It was found that glycerin transmits the nearly hydrostatic pressure even at 7 GPa. Using the hybrid-anvil device, single-crystal magnetic neutron diffraction experiments on valence transition material YbInCu4 were performed up to 6.2 GPa. In spite of the small magnetic moment of less than 1μB/Yb, distinct magnetic signals were observed. This was accomplished by using the thermal neutron focusing device with the hybrid-anvil device.

Journal

  • hamon

    hamon 18 (4), 208-213, 2008

    The Japanese Society for Neutron Science

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