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
Hematite, a common oxide of iron, transits from antiferromagnetic to weak ferromagnetic phase, In this transition, i. e. Morin transition the direction of spin rotates 90°. Many scientists have found that Morin t...Hematite, a common oxide of iron, transits from antiferromagnetic to weak ferromagnetic phase, In this transition, i. e. Morin transition the direction of spin rotates 90°. Many scientists have found that Morin temperature is a function of the applied magnetic field, pressure and the size of particles. Now our experiments have showed that surface absorption of a little cobalt can also seriously affect the properties of hematite, and so greatly change the Morin transition procedure. By using special technique, α-FeOOH展开更多
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Hematite, a common oxide of iron, transits from antiferromagnetic to weak ferromagnetic phase, In this transition, i. e. Morin transition the direction of spin rotates 90°. Many scientists have found that Morin temperature is a function of the applied magnetic field, pressure and the size of particles. Now our experiments have showed that surface absorption of a little cobalt can also seriously affect the properties of hematite, and so greatly change the Morin transition procedure. By using special technique, α-FeOOH
