Search for High T_c Superconductors Capable Selective Doping
寻找具有选择性掺杂能力的高温超导体
基本信息
- 批准号:03555001
- 负责人:
- 金额:$ 3.97万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Developmental Scientific Research (B)
- 财政年份:1991
- 资助国家:日本
- 起止时间:1991 至 1992
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The purpose of the project is to search for high T_c marerials suitable for the electronic device application. Two approaches have been adopted. One is a search for materials with less anisotropy and longer coherence length which would relrese the difficulty in utilizing the high-T_c materials for conventional superconducting devices such as Josephson and three-terminal devices. It has been demonstrated that a perovskite oxide, Ba_<1-x>K_xBiO_3 with T_c=30K, is most promising and there is a possibility to fabricate all-oxide-SIS junctions using this material.The second is to search for potential materials which might lead to the development of a novel high T_c electronic device using properties unique to high T_c's. PrBa_2Cu_3O_7 - Pr-substituted compound of YBa_2Cu_3O_7(Y123) - is found to be a most interesting candidate. The present study has revealed that the CuO_2 planes in Pr123 are not doped with holes, which is the reason for non-metallic property, due to relatively small Madelung energy difference between in-plane O and Cu site as well as to the valence fluctuation of Pr. The magnitude of the Madelung energy difference is comparable with that in Pr_2CuO_4, a parent material of N-type high T_c superconductors. This fact strongly suggests that Pr123 might be doped with electrons. Attempts for N-type doping have been made by substituting Ce for Pr, La for Ba or F for O, though N-type doping has not been successful yet. If Pr123 were made an N-type superconductor, it would open a door to the development of a novel high T_c device with superconducting PN junctions in a Pr123/Y123 superlattice. Pr123/Y123 superlattice.
本课题的目的是寻找适合于电子器件应用的高T_c材料。采取了两种办法。一是寻找各向异性小、相干长度长的超导材料,以解决高T_c超导材料在常规超导器件如约瑟夫森和三端器件中应用的困难。研究表明,<1-x>T_c= 30 K的钙钛矿型氧化物Ba_ K_xBiO_3是最有前途的材料,有可能用它来制备全氧化物-SIS结。PrBa_2Cu_3O_7 -Pr取代YBa_2Cu_3O_7(Y_(123))-的化合物是一个很有意义的候选者。研究表明,Pr_(123)中CuO_2面没有空穴掺杂,这是由于面内O位和Cu位的Madelung能差较小以及Pr的价态涨落所致,其Madelung能差的大小与N型高温超导体母体Pr_2CuO_4相当。这一事实有力地表明Pr 123可能掺杂了电子。虽然N型掺杂还没有成功,但已经尝试通过用Ce代替Pr、La代替Ba或F代替O来进行N型掺杂。如果Pr 123成为N型超导体,将为在Pr 123/Y 123超晶格中研制新型高T_c超导PN结器件打开一扇大门。Pr 123/Y123超晶格。
项目成果
期刊论文数量(28)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
有馬 孝尚: "Optical excitations in CuO_2 sheets and their strong dependence on Cu-O coordination and bond length" Phys.Rev.B. 44. 917-920 (1991)
Takahisa Arima:“CuO_2 片中的光学激发及其对 Cu-O 配位和键长的强烈依赖性”Phys.Rev.B. 44. 917-920 (1991)
- DOI:
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- 影响因子:0
- 作者:
- 通讯作者:
S. Uchida: "Electronic structure and fermiology of high T_c superconductors: Experimental summary" J. Phys. Chem.Solids 53. 1717-1720 (1992)
S. Uchida:“高 T_c 超导体的电子结构和费米学:实验总结”J. Phys。
- DOI:
- 发表时间:
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- 影响因子:0
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- 通讯作者:
M.Alexander: "Electronic Structure studies on the N-type doped superconductors by electron-energy-loss spectroscopy" Phys.Rev.B. 43. 333-343 (1991)
M.Alexander:“通过电子能量损失光谱研究 N 型掺杂超导体的电子结构”Phys.Rev.B。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Y. Nakamura: "Anisotropic transport properties of single crystal La_<2-x-y>Nd_ySr_xCuO_4" Phys. Rev.B46. 5841-5844 (1992)
Y. Nakamura:“单晶La_<2-x-y>Nd_ySr_xCuO_4的各向异性传输特性”Phys。
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- 影响因子:0
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- 通讯作者:
S. Uchida: Elseiver Science Publishers. Electronic Properties and Mechanism of high T_c Superconductors - Optical study of the high T_c cuprates, 433 (1992)
S. Uchida:Elseiver Science 出版社。
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- 影响因子:0
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UCHIDA Shin-ichi其他文献
UCHIDA Shin-ichi的其他文献
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{{ truncateString('UCHIDA Shin-ichi', 18)}}的其他基金
Synthesis of high-Tc superconductor compposed of Sr, Cu and O and enhancement of Tc by ordering of apical O atoms
由Sr、Cu和O组成的高温超导体的合成以及通过顶端O原子的有序化提高Tc
- 批准号:
22340094 - 财政年份:2010
- 资助金额:
$ 3.97万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Role of apical oxygen atoms in the electronic structure and pair formation in high-Tc superconductors
顶端氧原子在高温超导体电子结构和电子对形成中的作用
- 批准号:
19340093 - 财政年份:2007
- 资助金额:
$ 3.97万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Microscopic electronic heterogeneity and its effect on the optical spectrum of high-temperature superconductors
高温超导体微观电子异质性及其对光谱的影响
- 批准号:
15204030 - 财政年份:2003
- 资助金额:
$ 3.97万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Search and Control of Josephson Plasma Modes in 7^* Type High-Tc Superconductors
7^*型高温超导体约瑟夫森等离子体模式的搜索与控制
- 批准号:
13450007 - 财政年份:2001
- 资助金额:
$ 3.97万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Dynamics of Spin-Charge Stripe Order in La-Based High Tc Cuprates
La 基高温铜氧化物中自旋电荷条纹有序的动力学
- 批准号:
10440099 - 财政年份:1998
- 资助金额:
$ 3.97万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Far-infrared plasma and electromagnetic waves in anisotropic superconductors
各向异性超导体中的远红外等离子体和电磁波
- 批准号:
07455004 - 财政年份:1995
- 资助金额:
$ 3.97万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
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