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Development of High Performances and Novel Functions in Low-Growth Temperature (Cu, C) Superconducting Film by Controlling Multi-layer Structure

通过控制多层结构开发低生长温度（Cu，C）超导薄膜的高性能和新功能

基本信息

批准号：
20560305
负责人：
TERADA Norio
金额：
$ 3万
依托单位：
Kagoshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2008
资助国家：
日本
起止时间：
2008 至 2010
项目状态：
已结题

项目摘要

Thin film process and enhancement of properties of (Cu, C)-system [(Cu,C)Ba_2Ca_<n-1>Cu_nO_x:(Cu,C)-12(n-1)n] high temperature superconductors have been studied. Contrary to the necessity of high temperature and high pressure for fabrication of bulk ceramics of this system, thin films of (Cu,C)-1201 phase have successfully synthesized by utilizing pulsed laser deposition on SrTiO_3 substrate under CO_2 mixed atmosphere. The (Cu,C)-1201 films show technological merits of the low growth temperature of 500～600 ℃ and superconducting critical temperature about 50 K which is sufficient to applications of high-speed digital circuits. Though surface roughness of the 1201 films directly on the substrate exceeded c-axis lattice parameter of this phase, it has been improved up to sub-nano meter level by the insertion of SrCuO_2 buffer with infinite layer structure between the 1201 film and the substrate. The (Cu,C)-1201/SrCuO_2 structures exhibit similar superconducting properties. These results mean that it is satisfied the necessary conditions for the investigation of the effect of multi-stacking of 1201 and related layers on superconducting properties of it. In the present study, remarkable enhancements of critical temperature are achieved in [CaCuO_2/(Cu,C)-1201]×N (N : repetition number of fundamental structure) multi-layered structure. T_<c-onset> and T_<c(ρ=0)> reach～100 K and >70 K, respectively. It is also noteworthy that the growth temperature of such high-T_c specimens still stays around 500℃. Structural analysis of the high-T_c specimens has revealed the strain at their hetero-interfaces is the main origin of the enhancement of superconductivity.The achievements mentioned above shows that the novel superconducting film withtechnological merits : high T_c and low growth temperature, without toxic element has developed by adopting the hetero-interface effect to (Cu,C)-1201 layer, which also means the objective of this research is successfully achieved.

本文研究了（Cu，C）系[（Cu，C）Ba_2Ca_Cu_nO<n-1>_x：（Cu，C）-12（n-1）n]高温超导体的成膜工艺和性能增强。与制备该系统块体陶瓷所需的高温高压相反，在CO_2混合气氛下，利用脉冲激光沉积技术在SrTiO_3衬底上成功地制备了（Cu，C）-1201相薄膜。（Cu，C）-1201薄膜具有生长温度低（500~600 ℃），超导临界温度约为50 K的优点，可用于高速数字电路。直接在衬底上生长的1201薄膜的表面粗糙度虽然超过了该相的c轴晶格参数，但通过在1201薄膜和衬底之间插入具有无限层状结构的SrCuO_2缓冲层，使其表面粗糙度提高到亚纳米级。（Cu，C）-1201/SrCuO_2结构具有类似的超导性质。在[CaCuO_2/（Cu，C）-1201]×N（N：基本结构的重复数）多层结构中，临界温度得到了显著的提高。T_<c-onset>和T_<c（ρ=0）>分别达到~100 K和>70 K。值得注意的是，这种高T_c样品的生长温度仍然保持在500℃左右。对高温超导样品的结构分析表明，异质界面处的应变是超导电性增强的主要原因。利用（Cu，C）-1201层的异质界面效应，获得了高T_c、低生长温度、无有毒元素的薄膜，这也意味着本研究的目的成功实现。

项目成果

期刊论文数量（0）

专著数量（0）

科研奖励数量（0）

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Spin-Liquid State Study of Equilateral Triangle $S=3/2$ Spin Tubes Formed in CsCrF4

CsCrF4 中形成的等边三角形 $S=3/2$ 自旋管的自旋液态研究

DOI：
10.1143/jpsj.78.093701
发表时间：
2009
期刊：
Journal of the Physical Society of Japan
影响因子：
1.7
作者：
H. Manaka;Y. Hirai;Yuta Hachigo;M. Mitsunaga;Masakazu Ito;N. Terada
通讯作者：
N. Terada

In-situ characterization of transport properties of superconducting (Cu, C)-1201 films

超导 (Cu, C)-1201 薄膜输运特性的原位表征

DOI：
发表时间：
2009
期刊：
Journal of Physics Conf.Series vol.150
影响因子：
0
作者：
K.Kikunaga;T.Yamamoto;M.Mitsunaga;Y.Mahara;Y.Tanaka;N.Kikuchi;K.Tokiwa;T.Watanabe;N.Terada
通讯作者：
N.Terada

Synthesis of suoerconducting (Cu, C)-Ba-O films on SuCuO_2 buffer by pulsed laser deposition

脉冲激光沉积在SuCuO_2缓冲层上合成超导(Cu,C)-Ba-O薄膜

DOI：
发表时间：
2009
期刊：
J.Phys.Conf.Series vol.150
影响因子：
0
作者：
T.Yamamoto;K.Kikunaga;M.Mitsunaga;T.Okuda;K.Obara;N.Kikuchi;Y.Tanaka;K.Tokiwa;T.Watanabe;N.Terada
通讯作者：
N.Terada

Synthesis of superconducting (Cu, C)-Ba-O films on SrCuO2 buffer by pulsed laser deposition

脉冲激光沉积在 SrCuO2 缓冲层上合成超导 (Cu, C)-Ba-O 薄膜