2017 Fiscal Year Final Research Report
Vortex state of antiferromagnetic superconductor with intrinsic Josephson junctions
Project/Area Number |
26390050
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Applied materials
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Research Institution | National Institute for Materials Science |
Principal Investigator |
Mochiku Takashi 国立研究開発法人物質・材料研究機構, 先端材料解析研究拠点, 主幹研究員 (20354293)
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Project Period (FY) |
2014-04-01 – 2018-03-31
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Keywords | 高温超伝導 / 磁性超伝導体 / 結晶構造 / 磁気相図 |
Outline of Final Research Achievements |
FeSr2YCu2O6+δ is magnetic superconductor which exhibits superconductivity at 60 K and antiferromagnetism of Fe at 20 K. The properties are different from those of parent material Ba2YCu3O6+δ. In Fe1-xSr2YCu2+xO6+δ, the compounds above x = 0.4 do not exhibit antiferromagentism, and the Tc value has the minimum value at x = 0.3. In lanthanoid(Ln)-substituted FeSr2LnCu2O6+δ, the Tc value has the maximum value at Ln = Y, and the Tc value decreases with increasing the difference of the ionic radius between Y and Ln except for Tb. The Tc value of FeSr2TbCu2O6+δ, which exhibits 2-dimensional magnetic order of Tb, falls to 28 K. Since the intragrain critical current density is extremely low (1.7 A/cm2 at 2 K), magnetism of Fe and Ln affects the vortex state. Consequently, the superconducting properties are different from those of Ba2YCu3O6+δ.
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Free Research Field |
結晶学
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