Thin superconducting films of YBa_(2)Cu_(3)O_(7-Δ) have been prepared by magnetron reactive sputter deposition and subsequent heat treatment・The composition of the thin films has been determined by x-ray fluorescence...Thin superconducting films of YBa_(2)Cu_(3)O_(7-Δ) have been prepared by magnetron reactive sputter deposition and subsequent heat treatment・The composition of the thin films has been determined by x-ray fluorescence spectrum analysis,the structure by x-ray diffraction,and the morphology by scannina electron microscope,The results indicated that the crystallization process of the thin films on different substrates are markedly different.Best results are obtained on film deposited on SrTiO_(3) substrate,however,there still exists some non-superconducting phase at the grain boundaries making the superconducting phase weakly linked.展开更多
The oxide compounds of Ba_(x)Y_(1-x)CuO_(3-y)(x=0.3-0.5)have been successfully prepared.The zero resistance temperature of the samples is at 91.5K.with Tc onesets higher than 100K.The ac magnetic susceptibility measur...The oxide compounds of Ba_(x)Y_(1-x)CuO_(3-y)(x=0.3-0.5)have been successfully prepared.The zero resistance temperature of the samples is at 91.5K.with Tc onesets higher than 100K.The ac magnetic susceptibility measurements show that the superconducting phase at 82K is not less than 85%in volume.展开更多
We briefly describe our results to date on the magnetron sputtering deposition of Ba_(x)Y_(1+x)CuO_(3-y) thin films with T_(c) onset=96K and T_(R=0)=83K.We emphasize the importance of the characteristics of the substr...We briefly describe our results to date on the magnetron sputtering deposition of Ba_(x)Y_(1+x)CuO_(3-y) thin films with T_(c) onset=96K and T_(R=0)=83K.We emphasize the importance of the characteristics of the substrate material.The perovskite-SrTiO_(3) substrate ddposits high T_(R=0) and J_(c) films.X-ray diffraction studies show that they are of single phase orthorhombic perovskite structure.展开更多
The magnetization M(T)at a fixed field,the magnetization M(H)at different temperatures of the Ba-Y-Cu-O samples with zero resistance at 91.5K have been measured.The results show that Ba-Y-Cu-O is a type-II superconduc...The magnetization M(T)at a fixed field,the magnetization M(H)at different temperatures of the Ba-Y-Cu-O samples with zero resistance at 91.5K have been measured.The results show that Ba-Y-Cu-O is a type-II superconductor.We also present the anomaly of M(T)at low temperature.At T approaching OK,M(H)changes from negative to positive.The relationship between the area of magnetic hysteresis loop and the critical current density is discussed.展开更多
Point-contact tunneling measurements of the oxide superconductor Y-Ba-Cu-O were carried out with both Nb and Mo tips.An energy gap,Δ=18.5meV and 2Δ/kT_(c)=4.7 were obtained.The result is consistent with the strong-c...Point-contact tunneling measurements of the oxide superconductor Y-Ba-Cu-O were carried out with both Nb and Mo tips.An energy gap,Δ=18.5meV and 2Δ/kT_(c)=4.7 were obtained.The result is consistent with the strong-coupling theory.The tunneling conductance curves indicate a granular feature of the sample.展开更多
High Tc Ba-Y-Cu-O thin films have been successfully prepared by the RF magnetron sputtering method.The highest Tc onset is determined to be 89.5K and the Tc midpoint is about 55K.Inductive measurement showed that the ...High Tc Ba-Y-Cu-O thin films have been successfully prepared by the RF magnetron sputtering method.The highest Tc onset is determined to be 89.5K and the Tc midpoint is about 55K.Inductive measurement showed that the samples are diamagnetic and the Meissner effect appeared around 10K.展开更多
High Tc Sr-La-Cu-0 thin films have been successfully prepared by magnetron sputtering method.Their superconducting transitron temperatures Tc are determined to be 25-27,3K and the transztzon widths 7.5-8.5K.
文摘Thin superconducting films of YBa_(2)Cu_(3)O_(7-Δ) have been prepared by magnetron reactive sputter deposition and subsequent heat treatment・The composition of the thin films has been determined by x-ray fluorescence spectrum analysis,the structure by x-ray diffraction,and the morphology by scannina electron microscope,The results indicated that the crystallization process of the thin films on different substrates are markedly different.Best results are obtained on film deposited on SrTiO_(3) substrate,however,there still exists some non-superconducting phase at the grain boundaries making the superconducting phase weakly linked.
文摘The oxide compounds of Ba_(x)Y_(1-x)CuO_(3-y)(x=0.3-0.5)have been successfully prepared.The zero resistance temperature of the samples is at 91.5K.with Tc onesets higher than 100K.The ac magnetic susceptibility measurements show that the superconducting phase at 82K is not less than 85%in volume.
基金supported by the National Science Foundation of China。
文摘We briefly describe our results to date on the magnetron sputtering deposition of Ba_(x)Y_(1+x)CuO_(3-y) thin films with T_(c) onset=96K and T_(R=0)=83K.We emphasize the importance of the characteristics of the substrate material.The perovskite-SrTiO_(3) substrate ddposits high T_(R=0) and J_(c) films.X-ray diffraction studies show that they are of single phase orthorhombic perovskite structure.
基金supported by the Science Fund of the Chinese Academy of Sciences。
文摘The magnetization M(T)at a fixed field,the magnetization M(H)at different temperatures of the Ba-Y-Cu-O samples with zero resistance at 91.5K have been measured.The results show that Ba-Y-Cu-O is a type-II superconductor.We also present the anomaly of M(T)at low temperature.At T approaching OK,M(H)changes from negative to positive.The relationship between the area of magnetic hysteresis loop and the critical current density is discussed.
文摘Point-contact tunneling measurements of the oxide superconductor Y-Ba-Cu-O were carried out with both Nb and Mo tips.An energy gap,Δ=18.5meV and 2Δ/kT_(c)=4.7 were obtained.The result is consistent with the strong-coupling theory.The tunneling conductance curves indicate a granular feature of the sample.
文摘High Tc Ba-Y-Cu-O thin films have been successfully prepared by the RF magnetron sputtering method.The highest Tc onset is determined to be 89.5K and the Tc midpoint is about 55K.Inductive measurement showed that the samples are diamagnetic and the Meissner effect appeared around 10K.
文摘High Tc Sr-La-Cu-0 thin films have been successfully prepared by magnetron sputtering method.Their superconducting transitron temperatures Tc are determined to be 25-27,3K and the transztzon widths 7.5-8.5K.
