Papers by Keyword: LSCO

Abstract: It is known that Cu valence of cuprate superconductors govern transition temperature (T_c). For La_2-xSr_xCuO_y, when x = 0.15, that is, Cu valence is 2.15, the highest T_c around 40K is achieved. The Cu valence is determined both by strontium and oxygen content. So far, coulometry and iodometry have been used for determining oxygen content. However, these chemical analyses usually require experience. The purpose of this research is to develop a novel measuring method of oxygen content in cuprate superconductors with a developed dissolved oxygen sensor. Signal received from the sensor is sent to PC automatically without any external power supply. Oxygen content obtained with the sensor was newly compared with iodometry. It was found that this method is reliable enough to determine oxygen content in La_2-xSr_xCuO_y, and is called dissolved oxygen method.

Abstract: We have investigated the ferroelectric and electrical properties of PZT 40/60 films on the bottom La_1/2Sr_1/2CoO₃(LSCO) electrode. The LSCO bottom electrode was sputtered on the SiO₂/Si(100). As the annealing temperature of PZT capacitors on the LSCO is increased, the ferroelectric properties gradually increase with the annealing temperature up to 650°C. However, for the PZT capacitors annealed above 650°C, electrical measurement cannot be performed.