A_2Nb_<1+X>O_Y (A=Ca, Sr) (0〓x〓5) : New Reduced Niobate Superconductors with the Distorted Defect-Perovskite Structure

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概要

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• From the DC magnetization and powder X-ray diffraction (XRD) measurements, in the defect-perovskitc-type reduced niobates A_2Nb_<1+X>O_Y (A=Ca, Sr), we found at least two kinds of broad superconducting phases with the critical temperatures of about 9.2 K (for 0〓x〓1.0) and 8.3 K (for 1.2-1.5〓x〓5.0) covering almost the whole valence state of Nb from Nb^<1+> to Nb^<5+> in the Ca system and in the somewhat narrower range in the Sr system. The highest shielding effect in these phases of both systems is attained for samples prepared from the starting mixtures having the initial mean Nb valence between 1+ and 2 +.

• 社団法人応用物理学会の論文
• 1994-04-15

著者

• Nakamura Akio

  Japan Atomic Energy Research Institute Department Of Chemistry And Fuel Research

• Nakamura Akio

  Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan

関連論文

• A_2Nb_O_Y (A=Ca, Sr) (0〓x〓5) : New Reduced Niobate Superconductors with the Distorted Defect-Perovskite Structure
• Magnetic and Dielectric Properties of Tb0.5Ca0.5MnO3

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