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Superconductivity of (R0.4Pr0.6)0.5Ca0.5Ba2Cu3O7-δ (R= La, Pr, Nd, Sm, Eu, Gd and Y) Prepared Under High Pressure |
| XIONG Han;CHE Guang-Can;YAO Yu-Shu;NI Yong-Ming;LIU Zhen-Xing;JIA Shun-Lian;DONG Cheng;ZHAO Zhong-Xian |
| National Laboratory for Superconductivity, Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
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| Cite this article: |
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XIONG Han, CHE Guang-Can, YAO Yu-Shu et al 2001 Chin. Phys. Lett. 18 684-686 |
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Abstract The nearly single phase (R0.4Pr0.6)0.5Ca0.5Ba2Cu3O7-δ compounds (R= La, Pr, Nd, Sm, Eu, Gd and Y) with Tc about 100 K were prepared under high pressure and high temperature using the cubic anvil apparatus. The Tc is much higher than that of the traditional R-123 superconductors without doping Ca on the rare-earth site. For various rare earths with different ionic radius, the (R0.4Pr0.6)0.5Ca0.5Ba2Cu3O7-δ compounds have almost the same critical temperature. This is different from the result of the ion-size effect of rare-earth ions in R1-xPrxBa2Cu3O7-δ compounds. Our results show that Pr has the same properties as other rare earths in the 123-phase compounds due to the doping of Ca.
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| Keywords:
74.72.Bk
74.72.Jt
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Published: 01 May 2001
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