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首页> 外文会议>Conference on High Temperature Superconductivity Coral Gables, Florida January 7-13 1999 >Observations of YBCO superconductors under a low-temperature scanning electron microscope
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Observations of YBCO superconductors under a low-temperature scanning electron microscope

机译：YBCO超导体的低温扫描电子显微镜观察

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摘要

Microscopic analyses have been performed on YBCO superconductors with Ca-doping and Gd-doping as a functioj of temperature by employing a low-temperature scanning electron microscope (LTSEM). Onlowering temperature of the sample from 300 K to 90K, the brightness of the SEM image changes due to the change in resistance of the sample. For the underdoped cuperates Y_(1-x)Ca_xBa_2Cu_3O_(7- delta ), with x chemical bounds 0.2, the pseudo gap in the normal state is opended at a temperature T~* which far below the ciritical temperature T_c of the superconductor. The opening of the seuod gap has directly been observed under LTSEM (temperature fluctuating in the range of +-5 K). At temperature T~* the formation of quasi-p0articles takes place, thus a sudden brightness change in the SEM image is observed. The results of these measurements are comnpared with the four-point probe measurement. It is proved that the data of these two measurements are quite in agreement with each other.
机译：通过采用低温扫描电子显微镜（LTSEM）对YBCO超导体进行了微观分析，其中Ca掺杂和Gd掺杂作为温度的函数。将样品的温度从300 K降低到90K，SEM图像的亮度会因样品电阻的变化而变化。对于欠掺杂的铜酸盐Y_（1-x）Ca_xBa_2Cu_3O_（7-delta），具有x个化学界为0.2，正常状态下的伪间隙在远低于超导体的圆弧温度T_c的温度T〜*处打开。在LTSEM（温度在+ -5 K范围内波动）下直接观察到了seuod缝隙的打开。在温度T *时，形成准颗粒，因此在SEM图像中观察到突然的亮度变化。这些测量的结果与四点探针测量相比较。事实证明，这两次测量的数据非常吻合。

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