Superconductivity and structure analysis of Ru-based Sr2YRuO6 2116 Cu-doping system
博士 === 淡江大學 === 物理學系 === 85 === This thesis presents a systematic study on the synthesis and the physicalproperties of the Cu-doped double perovskites Sr2Y(Ru1- xCux)O6 (2116). Its crystalline structure was determined to be of orthorhombic symmetry withsp...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
1997
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| Online Access: | http://ndltd.ncl.edu.tw/handle/33955535184236021881 |
| Summary: | 博士 === 淡江大學 === 物理學系 === 85 === This thesis presents a systematic study on the synthesis and the
physicalproperties of the Cu-doped double perovskites Sr2Y(Ru1-
xCux)O6 (2116). Its crystalline structure was determined to be
of orthorhombic symmetry withspace group Pbnm by X-ray powder
diffraction Rietveld method. A substantialincrease of
conductivity and finally the appearance of superconductivity
with Tc ranging from 10K to 60K were observed in samples with
partial substitution of Ru ion by Cu in the parent
antiferromagnetic insulator Sr2YRuO6. The resistive transition
in the presence of magnetic field exhibits different behavior
than that of the 123 cuprate superconductor. Furthermore, we
observed an almost coincidence of superconducting transition
temperature Tcwith an magnetic ordering temperature Tm sugggest
the coexistence of superconductivity and magnetic ordering.
These observed anomalous properties can be best described in
termsof the"double exchange" model proposed by De Gennes.
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