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• Main Authors: Jiun-Kao Ho, 何鈞考
• Other Authors: Wen-Shien Li
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/8d5xj4

碩士 === 國立中央大學 === 物理研究所 === 94 === Abstract Tin nanoparticles were fabricated by the thermal evaporation method. A series of eight Tin nanoparticles having different particle diameters was obtained by controlling the Argon pressure and the heating current employed during evoaporation. The temperature dependence of the magnetic susceptibility may be described by using London equation or Scalapino equation. We found that London equation is inadequate in describing the diamagnetic responses in the critical regime where critical fluctuation is evident. The fluctuation behavior exhibited in the regime may be described very well by the Scalapino equation. The penetration depth was found to decrease with reducing particle diameter. The critical magnetic field Hc and the critical temperature Tc were found to be significantly affected by the particle diameter. Variation profiles with peak structures were found in the size dependences of the Hc, Tc, and coupling strength plots. The critical magnetic field and the critical temperature reach the maximum value for 14nm particle .