Research on single-crystal growth and carrier doping for high-temperature superconductors

高温超导体单晶生长及载流子掺杂研究

基本信息

批准号：
14550002
负责人：
YOSHIZAKI Ryozo
金额：
$ 2.18万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550002/
关键词：
Bi-2201 phase Bi-2212 phase superconducting whisker second peak effect flux-flow state whiskers in nanometer size BPSLCO area control growth of whiskers 銅酸化物高温超伝導体キャリヤー数の最適化セカンドピークウィスカーの成長選択的にウィスカーの成長高温超伝導 Bi系銅酸化物ヒゲ結晶成長

项目摘要

We have studied about two themes ; growth and control of superconducting whiskers in Bi-2212 phase and growth and characterization of high-quality and higher Tc superconductors in Bi-2201 phase.In the growth of whiskers, we obtained many results successfully. The distinguished results are as follows, (1)growth of high quality whiskers with our original powder-compaction method, (2)observed new second peak effect in Jc at high temperatures above 70 K, (3)area control growth of whiskers, and (4)growth of nanometer-size whiskers. These results will open the way for superconducting whiskers to be used in superconducting cables as fillers with high-quality superconducting elements and in superconducting wirings in nanometer scale electronic elements.In the other theme of growth control with higher Tc in Bi-2201 phase, we succeeded to obtain the superconductors with Tc higher than 40 K in single crystals by adopting a Pb and La co-doping method, which is almost new trial in this field. The highest Tc obtained in our study is 43.8 K in zero-resistance temperature, which is the world record ever obtained in Bi-2201 phase. The crystal structures are still orthorhombic but the modulation periods are elongated by three times compared to the undoped materials. As serendipity of the research, we observed the superconductivity with the onset temperature of about 80 K in Bi-2201 phase. The origin of the superconductivity is still under investigation now.

我们研究了两个主题。 BI-2212阶段中超导晶须的生长和控制，以及在BI-2201阶段的高质量和更高TC超导体的增长和表征。在晶须的生长中，我们成功地获得了许多结果。杰出的结果如下：（1）使用我们的原始粉末复合方法的高质量晶须的生长，（2）在高于70 K的高温下，JC在JC中观察到了新的第二峰效应，（3）晶须的面积控制生长，（4）纳米尺寸晶须的生长。 These results will open the way for superconducting whiskers to be used in superconducting cables as fillers with high-quality superconducting elements and in superconducting wirings in nanometer scale electronic elements.In the other theme of growth control with higher Tc in Bi-2201 phase, we succeeded to obtain the superconductors with Tc higher than 40 K in single crystals by adopting a Pb and La co-doping method, which is almost new在这个领域的试验。在我们的研究中获得的最高TC是零耐药温度的43.8 K，这是BI-2201阶段获得的世界记录。晶体结构仍然是矫形器，但与未掺杂的材料相比，调制周期的伸长率伸长了三倍。作为研究的偶然性，我们观察到在BI-2201阶段的一开始温度约为80 K的超导性。超导性的起源目前仍在研究中。