New ferromagnets of Sr8ARe3Cu4O24 (A=Sr, Ca) with an ordered perovskite structure |
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| Authors: | E Takayama-Muromachi T Drezen ND Zhigadlo Y Matsui |
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| Institution: | a National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japanb Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8537, Japan |
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| Abstract: | New phases Sr8ARe3Cu4O24 (A=Sr,Ca) were discovered under high-pressure/high-temperature condition. X-ray powder diffraction and electron diffraction studies for these phases indicated that they have an ordered perovskite-type structure with cubic lattices of ∼8 Å. They showed ferromagnetism at room temperature when they were synthesized under high-oxygen-pressure condition. The Ca-containing phase has a very high Tc of 440 K with a spontaneous magnetization of ∼1 μB/f.u. |
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| Keywords: | Ferromagnetism Cuprates Ordered perovskite Crystal structure Rietveld analysis |
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