顆粒間交互作用對銦奈米顆粒熱臨界擾動效應的影響; Inter-particle interaction's effect on thermal critical fluctuation of In nano-particle.

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题名:	顆粒間交互作用對銦奈米顆粒熱臨界擾動效應的影響;Inter-particle interaction's effect on thermal critical fluctuation of In nano-particle.
作者:	陳皇男;Huang-Nan Chen
贡献者:	物理研究所
关键词:	奈米顆粒;熱蒸鍍;超導;自發磁矩;s-wave;p-wave;熱臨界擾動;銦;thermal critical fluctuation;p-wave;s-wave;spontaneous magnetization;superconductivity;employing the thermal evaporation;nanoparticles;Indium
日期:	2011-07-01
上传时间:	2012-01-05 14:41:09 (UTC+8)
摘要:	使用熱蒸鍍冷凝法製作出銦奈米顆粒，並藉由XRD以及AFM判定銦奈米顆粒的粒徑為10.6 nm。為了探討顆粒間交互作用對10.6 nm銦的超導特性之影響，將樣品逐次的壓合並量測其在低於超導臨界溫度下交流磁化率以及直流磁化強度。由磁化率我們發現在低、中壓合密度樣品因為超導能隙縮小而有熱臨界擾動效應；在高壓合密度熱臨界擾動則不顯著。另外發現超導臨界溫度會隨著壓合密度的增加有先降後升的現象。在TC之下且無外加磁場觀察到樣品有自發性磁矩，且磁化強度對溫度的關係圖和磁化率對溫度的關係圖有相同的趨勢，因此推論10.6 nm銦除了有不具有磁矩的s-wave配對的超導電子對以外還有本身即有磁矩的p-wave配對超導電子對。 Indium nanoparticles (NPs) are fabricated by employing the thermal evaporation method. The mean particle diameter is determined to be 10.6 nm by XRD and AFM. In our study, the packing fraction of the nanoparticle compact is varied to investigate the effects of inter-particle interaction on the superconducting parameters of the extremely space-restricted Sn particles. Through AC magnetic susceptibility measurements, we observed that the critical fluctuation of the order superconducting parameter is evidently revealed, when the particles are loosely packed. Interparticle particle interaction suppresses the critical fluctuation so that the thermal behavior of the magnetic susceptibility can be described using London expression that ignores the critical behavior. A spontaneous magnetization is observed below TC. We propose that not only s-wave but also p-wave pairings appear in the present 10.6 nm In particles.
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