Preparation and Magnetization Properties of Rhenium-Doped Hg-Based Oxide Superconductors

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  • レニウム添加水銀系酸化物超伝導体の作製と磁化特性
  • レニウム テンカ スイギンケイ サンカブツ チョウデンドウタイ ノ サクセイ

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Mercury-based oxide superconductors, HgBa2Ca2Cu3O8+δ (Hg-1223), show the highest critical temperature, Tc≈135 K. Such high Tc has drawn keen interest both in physics and in applications, and recently it was found that Re doping brings about chemical and structural stabilization of the superconducting phase. We have investigated the preparation and magnetic properties of Re-doped Hg-1223 specimens to clarify their potential for power applications.<BR>Nearly phase-pure (Hg1−xRe0.1) Ba2Ca2Cu3O8+δ superconducting specimens were prepared by a conventional powder-mixing and encapsulation technique. The “BaCuO2” phase present in precursor powders seemed to hinder the formation of the Hg-1223 phase, and we prepared precursors at a partial melting temperature to reduce this phase. Auger and EPMA analyses showed that the doped Re atoms are actually incorporated in the Hg-1223 grains. Magnetization M was measured for grain-aligned powders and for the sintered bulk samples. The |M| decreased sharply just above the penetration field Hp in the field-increasing branch, and the M-H curves were completely asymmetric about the central line of M=0. This clearly shows that the magnetization originates from the Bean-Livingston surface barrier. The magnetic hysteresis curves of Re-doped Hg-1223 samples also exhibited paramagnetism, in which a Curie-Weiss behavior occurred above the critical temperature Tc.

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