The nearly single phase(R_(0.4)Pr_(0.6))_(0.5)Ca_(0.5)Ba_(2)Cu_(3)O_(7-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 nearly single phase(R_(0.4)Pr_(0.6))_(0.5)Ca_(0.5)Ba_(2)Cu_(3)O_(7-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(R_(0.4)Pr_(0.6))_(0.5)Ca_(0.5)Ba_(2)Cu_(3)O_(7-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-δcompounds.Our results show that Pr has the same properties as other rare earths in the 123-phase compounds due to the doping of Ca.展开更多
基金Supported by the Ministry of Science and Technology of China(NKBRSF-G19990646).
文摘The nearly single phase(R_(0.4)Pr_(0.6))_(0.5)Ca_(0.5)Ba_(2)Cu_(3)O_(7-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(R_(0.4)Pr_(0.6))_(0.5)Ca_(0.5)Ba_(2)Cu_(3)O_(7-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-δcompounds.Our results show that Pr has the same properties as other rare earths in the 123-phase compounds due to the doping of Ca.
