The structural,magnetic and superconducting properties of the Tl_(2)Ba_(2)(Ca_(1-x)Mg_(x))_(2)Cu_(3)O_(y)system with x=0,0.05,0.1,0.15,0.2,0.3,0.4,0.5 were studied.Replacement of calcium by magnesium depresses Tc from...The structural,magnetic and superconducting properties of the Tl_(2)Ba_(2)(Ca_(1-x)Mg_(x))_(2)Cu_(3)O_(y)system with x=0,0.05,0.1,0.15,0.2,0.3,0.4,0.5 were studied.Replacement of calcium by magnesium depresses Tc from 116.3K(x=0)to 93.3K(x=0.5).The critical current also decreases with increasing x.展开更多
The high Tc superconductor LaBa_(2-x)Ca_(x)Cu_(3)O_(y) has been studied and the composition dependence of Tc examined For x=1,Tconset=94K,Tc^(R=0)=80K.The structure of this system was refined utilizing the X-ray powde...The high Tc superconductor LaBa_(2-x)Ca_(x)Cu_(3)O_(y) has been studied and the composition dependence of Tc examined For x=1,Tconset=94K,Tc^(R=0)=80K.The structure of this system was refined utilizing the X-ray powder diffraction data,and it was found that the material is isostructural with YBa_(2)Cu_(3)O_(y).展开更多
The structure,magnetic,and superconducting properties of the (Tl_(1-x)Al_(x))2Ba_(2)Ca_(2)Cu_(3)O_(y) with x=0.05,0.1,0.15,0.2 were studied.The T_(c)^(R=0) depends on whether the sample has a 222S phase structure or h...The structure,magnetic,and superconducting properties of the (Tl_(1-x)Al_(x))2Ba_(2)Ca_(2)Cu_(3)O_(y) with x=0.05,0.1,0.15,0.2 were studied.The T_(c)^(R=0) depends on whether the sample has a 222S phase structure or has a 2212 phase structure.The magnetic properties in low field were measured and discussed.展开更多
文摘The structural,magnetic and superconducting properties of the Tl_(2)Ba_(2)(Ca_(1-x)Mg_(x))_(2)Cu_(3)O_(y)system with x=0,0.05,0.1,0.15,0.2,0.3,0.4,0.5 were studied.Replacement of calcium by magnesium depresses Tc from 116.3K(x=0)to 93.3K(x=0.5).The critical current also decreases with increasing x.
文摘The high Tc superconductor LaBa_(2-x)Ca_(x)Cu_(3)O_(y) has been studied and the composition dependence of Tc examined For x=1,Tconset=94K,Tc^(R=0)=80K.The structure of this system was refined utilizing the X-ray powder diffraction data,and it was found that the material is isostructural with YBa_(2)Cu_(3)O_(y).
文摘The structure,magnetic,and superconducting properties of the (Tl_(1-x)Al_(x))2Ba_(2)Ca_(2)Cu_(3)O_(y) with x=0.05,0.1,0.15,0.2 were studied.The T_(c)^(R=0) depends on whether the sample has a 222S phase structure or has a 2212 phase structure.The magnetic properties in low field were measured and discussed.