Formation of superconductivity through interparticle interactions in ferrimagnetic-like Sn nanoparticle assemblies

被引:2
作者
Li, Wen-Hsien [1 ]
Wu, Chun-Ming [1 ]
Wang, Chin-Wei [1 ]
Li, Chi-Yen [1 ]
Hsu, Chien-Kang [1 ]
机构
[1] Natl Cent Univ, Dept Phys, Jhongli 32001, Taiwan
关键词
Sn nanoparticle; Superconductivity; Ferrimagnetism; Interparticle interaction; ULTRASMALL METALLIC GRAINS; PARTICLES; NANOWIRES; FILMS;
D O I
10.1007/s11051-012-0764-1
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We report on the observation of the development of superconductivity through interparticle interactions in 3, 5, 7, and 23 nm ferrimagnetic-like Sn nanoparticle assemblies. The Sn nanoparticles are fabricated using the gas condensation method. Each sample consists of a macroscopic amount of individual Sn nanoparticles without a capping molecule. Ferrimagnetism is found but no sign of superconductivity can be detected when the 3 nm particles are very loosely assembled. A reduction in the mean particle moment results when the packing fraction of the assembly is increased. Superconductivity occurs when a critical packing fraction is reached. Beyond this, the superconducting transition temperature T-C continues to increase and noticeably exceeds that of the bulk T-C. The enhancement of superconductivity by interparticle interactions has also been observed in 5, 7, and 23 nm particle assemblies, with the effect becoming less significant in larger particles. We attribute these observations to the transfer of electrons between the surface and the core regions of the nanoparticles triggered by finite size effects and interparticle interactions.
引用
收藏
页数:9
相关论文
empty
未找到相关数据