Development and Application of Layer Structured Nitride Superconductors
层状结构氮化物超导体的开发与应用
基本信息
- 批准号:14350461
- 负责人:
- 金额:$ 9.6万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:2002
- 资助国家:日本
- 起止时间:2002 至 2003
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
We have reported that layer structured nitride halides β-MNX (M = Zr, Hf ; X = Cl, Br, I) electron-doped by intercalation of alkali metals became superconductors. In particular, the compound cointercalated with Li and THF (tetrahydrofuran), Lio_<48>(THF)_yHfNCl, showed a high critical temperature of Tc = 25.5 K. In this study, we have collaborated with solid state physicists to investigate the superconducting mechanism, and new types of layer structured nitrides have been developed. The main results obtained are the followings;1. Single crystals of β-MNX were successfully prepared using ammonium halides as fluxes under high-pressure conditions, and their structures were determined by the single crystal X-ray analysis.2. A new electron-doping method was developed by partial deintercalation of chlorine atoms to form β-ZrNCl_<1-x> and β-HfNCl_<1-x>, which were stable in air for pretty long time. The deintercalated samples showed similar superconductivity with those electron doped by alkali metal intercalation.3. Isotope substituted β-Hf^<15>NCl was prepared, and its superconductors were derived by electron doping.4. ^<15>N NMR study revealed that the layer structured nitride superconductors were two-dimensional ones with very low carrier densities and weak phonon enhancement. The mechanism of the new superconductors cannot be interpreted in the conventional BCS theory.5. The superconducting gap was successfully measured by a break-junction method.6. Layer structured Sr_2N oriented films were prepared by MBE method in a high vacuum chamber with a nitrogen radical source.
我们已经报道了层结构化的氮化卤化物β-MNX(M = Zr,Hf; X = Cl,Br,I)通过碱金属插入的电子掺杂变成了超导体。特别是,该化合物与Li和Thf(四氢呋喃)相关,LIO_ <48>(THF)_YHFNCL显示出TC = 25.5 K的较高临界温度。在这项研究中,我们与固态物理学家合作,与固体物理学家合作,以研究超管制机制,并开发了新型的层结构Nitrides nitrides nitrides nitries已开发。获得的主要结果是以下; 1。 β-MNX的单晶体使用卤化铵作为在高压条件下的通量成功制备,并通过单晶X射线分析确定其结构。2。通过部分去氯原子的部分去解剖来形成β-zrncl_ <1-x>和β-hfncl_ <1-x>,开发了一种新的电子掺杂方法,这些方法在很长一段时间内在空气中稳定。去解释的样品显示出与碱金属插入掺杂的电子相似的超导性。3。制备同位素取代的β-HF^<15> NCl,其超导体通过电子掺杂得出。4。 ^<15> N NMR研究表明,层结构的氮化层超导体是二维载体密度非常低的二维和弱语音增强的二维。新超导体的机制无法在常规BCS理论中解释5。超导差距通过分流方法成功测量。6。通过MBE方法在具有氮自由基的高真空室中通过MBE方法制备层结构化的SR_2N膜。
项目成果
期刊论文数量(101)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
X.Chen: "High-Pressure Synthesis and Crystal Structures of β-MNX(M=Zr, Hf ; X=Cl, Br, I)"J. Phys. Condens. Matter. 14. 11209-11212 (2002)
X.Chen:“β-MNX(M=Zr,Hf;X=Cl,Br,I)的高压合成和晶体结构”J.Matter。14。11209-11212(2002)
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- 影响因子:0
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- 通讯作者:
S.Yamanaka: "Synthesis and Properties of New Superconductors with Cage and Layered Structures"Jpn. J. Appl. Phys.. 41. 5008-5012 (2002)
S.Yamanaka:“笼式和层状结构新型超导体的合成和性能”Jpn。
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- 影响因子:0
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L.Zhu: "Preparation and Superconductivity of Chlorine-Deintercalated Crystals β-MNCl_<1-x>(M=Zr, Hf)"Chem. Mater.. (印刷中). (2003)
L. Zhu:“氯脱嵌晶体β-MNCl_<1-x>(M=Zr, Hf)的制备和超导性”,Chem. (2003)。
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H.Tou: "Superconducting characteristics in electron-doped layered hafnium nitride : ^<15>N isotope effect studies"Phys.Rev.B. 67. 100509/1-100509/4 (2003)
H.Tou:“电子掺杂层状氮化铪的超导特性:^15N同位素效应研究”Phys.Rev.B。
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- 影响因子:0
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- 通讯作者:
S.Yamanaka: "Superconductivity of Layer Structured TiNCl Intercalated with Pyridine"Molecular Crystals and Liquid Crystals. (印刷中).
S.Yamanaka:“层状结构 TiNCl 插入吡啶的超导性”分子晶体和液晶(正在出版)。
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- 影响因子:0
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YAMANAKA Shoji的其他基金
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神经节苷脂沉积症中枢神经系统炎症机制研究
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溶酶体贮积症病理生理学中自身抗体产生机制的研究
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具有多孔骨架的新型奇异超导体的制备和表征
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- 财政年份:2007
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A study on immunological abnormality in the lysosomal storage disease
溶酶体贮积症免疫异常的研究
- 批准号:1759035517590355
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多孔结构超导体的开发
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A study on pathogenesis and therapy of the lysosomal storage disease using ON-OFF (inducible transgeneic expression) system
利用ON-OFF(诱导转基因表达)系统研究溶酶体贮积症的发病机制和治疗
- 批准号:1457075714570757
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层状结构高温超导体的制备及性能
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Development of Photoelectron Emitting Materials in Ambient Atmosphere
环境大气光电子发射材料的研究进展
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新型层状结构超导体的合成与性能
- 批准号:0945032609450326
- 财政年份:1997
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