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dc.contributor.author韓顏吉en_US
dc.contributor.authorYan-Ji Hanen_US
dc.contributor.author林志忠en_US
dc.contributor.authorJuhn-Jong Linen_US
dc.date.accessioned2014-12-12T02:56:07Z-
dc.date.available2014-12-12T02:56:07Z-
dc.date.issued2005en_US
dc.identifier.urihttp://140.113.39.130/cdrfb3/record/nctu/#GT009321512en_US
dc.identifier.urihttp://hdl.handle.net/11536/78953-
dc.description.abstract對於金屬-絕緣體複合材料的導電率σ所具有的percolation行為,是早已眾所皆知。其值在p>pc時,將遵循一個簡單的power law:σ~(p-pc)t,其中pc為臨界體積比,t為臨界指數。但對於熱電勢所具有的percolation行為卻僅有理論上的探討,而缺乏有效且直接的實驗證據來支持。本實驗的目的便是為了驗證理論上認為:熱電勢在percolation threshold 附近的行為與σI/σM,γI/γM及(p-pc)有關,其中γ為熱導率,下標I及M分別代表絕緣體及金屬。而本實驗的結果符合此一理論,並得到在σI/σM << γI/γM時,S~(p-pc)-q且pc =pc’。 本篇論文中,我們研究一系列不同成份的三維粒狀結構金屬-半導體複合物:Aup -(PrBa2Cu3O7)1-p,其中ρPBCO/ρAu =100000,是良好的percolation系統。在實驗中採用4He低溫系統以及自製的樣品座來量測樣品從室溫到5 K的熱電勢以及導電率。zh_TW
dc.description.abstractThe percolation behavior of electrical conductivity,σ, in metal-insulator composites has been well established. For p > pc, a simple power law governs the electrical conductivity:σ ~ (p-pc)t, where t is a critical exponent and pc is the critical volume fraction. On the other hand, the percolation behavior of thermoelectric power has been only discussed theoretically, while there are few experimental results to test the theoretical predictions. In this work, we show that the behavior of thermoelectric power near the percolation threshold depends on three dimensionless parameters, namely, the electrical and thermal conductivity ratios of the two constituent components σI/σM, γI/γM , and the distance away from the percolation threshold Δp=(p-pc), where I and M stand for the insulator and metal, respectively. Our experimental result agrees with the theoretical prediction. In particular, we observe that, for σI/σM << γI/γM (which is pertinent to our case), S~(p-pc)-q. Our result also confirms that the percolations thresholds for electrical conductivity and thermoelectric power are the same, i.e., pc = pc’ to within our experimental uncertainty. Our samples are a series of three-dimensional granular metal-insulator composites: Aup-(PrBa2Cu3O7)1-p, which is an ideal percolation system with a resistivity ratio ρPBCO/ρAu =100000. Our resistivity and thermoelectric power measurements between room temperature and 5 K were performed on a 4He cryostat equipped with a homemade sample holder.en_US
dc.language.isozh_TWen_US
dc.subject熱電效應zh_TW
dc.subject展透zh_TW
dc.subject熱電勢zh_TW
dc.subject熱電偶zh_TW
dc.subject低溫zh_TW
dc.subject四點量測zh_TW
dc.subject鐠鋇銅氧zh_TW
dc.subject相變zh_TW
dc.subjectThermoelectric Effecten_US
dc.subjectPercolationen_US
dc.subjectThermoelectric Poweren_US
dc.subjectThermocoupleen_US
dc.subjectlow temperatureen_US
dc.subjectFour wires resistance measurementen_US
dc.subjectPBCOen_US
dc.subjectphase transitionen_US
dc.titleAup-(PrBa2Cu3O7)1-p之熱電勢的展透行為研究zh_TW
dc.titleThermoelectric Power and Percolation in Aup-(PrBa2Cu3O7)1-p compositesen_US
dc.typeThesisen_US
dc.contributor.department電子物理系所zh_TW
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