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Doping dependence of the ultrafast electronic dynamics of Y1-xPrxBa2Cu3O7-delta thin-film superconductors from femtosecond optical spectroscopy

(2010-09-17)

Luo, C. W.

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Lo, H. P.

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Su, C. H.

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Wu, I. H.

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Chen, Y. -J.

Time-domain spectroscopy, which probes the dynamics of the electronic states near Fermi surface that are associated with superconductivity, has proven to be a powerful method for providing insights into the fundamental nature of both pseudogap and superconducting gap. This study shows that the unique T-x phase diagram with the time-evolving ultrafast dynamics of Y1-xPrxBa2Cu3O7-delta can be used to identify clearly the Nernst, pseudogap, and superconducting regions. All of the orders appear together at a specific delay time, such as 1.2-3 ps, after pumping by an ultrashort pulse. These discoveries suggest that the Nernst effect, the pseudogap and even superconductivity may have the same physical origin.

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Doping dependence of the ultrafast electronic dynamics of Y(1-x)Pr(x)Ba(2)Cu(3)O(7-delta) thin-film superconductors from femtosecond optical spectroscopy

(2010-09-17)

Luo, C. W.

;

Lo, H. P.

;

Su, C. H.

;

Wu, I. H.

;

Chen, Y. -J.

Time-domain spectroscopy, which probes the dynamics of the electronic states near Fermi surface that are associated with superconductivity, has proven to be a powerful method for providing insights into the fundamental nature of both pseudogap and superconducting gap. This study shows that the unique T-x phase diagram with the time-evolving ultrafast dynamics of Y(1-x)Pr(x)Ba(2)Cu(3)O(7-delta) can be used to identify clearly the Nernst, pseudogap, and superconducting regions. All of the orders appear together at a specific delay time, such as 1.2-3 ps, after pumping by an ultrashort pulse. These discoveries suggest that the Nernst effect, the pseudogap and even superconductivity may have the same physical origin.

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Giant Hall effect in nonmagnetic Mo/SnO(2) granular films

(2010-09-17)

Wu, Ya-Nan

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Li, Zhi-Qing

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Lin, Juhn-Jong

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電子物理學系

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物理研究所

We have measured the resistivities and Hall coefficients, R(H), of a series of nonmagnetic Mo(x)(SnO(2))(1-x) nanogranular films with the Mo volume fraction x ranging from similar to 0.29 to 1. We found that the magnitude of R(H)(2 K) largely increased by a factor of similar to 800 as x was reduced from similar to 0.8 to similar or equal to 0.36. Then, it slightly decreased with a further decrease in x down to similar or equal to 0.32, which was determined to be the classical percolation threshold, x(c), from the resistivity dependence on x. This nearly 3 orders of magnitude enhancement in R(H) at a metal volume fraction x > x(c) is explained in terms of the recent theoretical concept of the local quantum-interference effect induced giant Hall effect in granular systems.

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Giant Hall effect in nonmagnetic Mo/SnO2 granular films

(2010-09-17)

Wu, Ya-Nan

;

Li, Zhi-Qing

;

Lin, Juhn-Jong

;

電子物理學系

;

物理研究所

We have measured the resistivities and Hall coefficients, R-H, of a series of nonmagnetic Mo-x(SnO2)(1-x) nanogranular films with the Mo volume fraction x ranging from similar to 0.29 to 1. We found that the magnitude of R-H(2 K) largely increased by a factor of similar to 800 as x was reduced from similar to 0.8 to similar or equal to 0.36. Then, it slightly decreased with a further decrease in x down to similar or equal to 0.32, which was determined to be the classical percolation threshold, x(c), from the resistivity dependence on x. This nearly 3 orders of magnitude enhancement in R-H at a metal volume fraction x > x(c) is explained in terms of the recent theoretical concept of the local quantum-interference effect induced giant Hall effect in granular systems.

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新手上路

(2010-09-19)

張芳瑜

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Department of Communication and Technology

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傳播與科技學系

我的喀報新手上路

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新手上路

(2010-09-19)

張宇翔

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Department of Communication and Technology

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傳播與科技學系

關於喀報

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新手上路

(2010-09-19)

劉怡潔

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Department of Communication and Technology

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傳播與科技學系

我要寫新手上路

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喀報閱後心得

(2010-09-19)

蔡妙鈴

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Department of Communication and Technology

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傳播與科技學系

喀報閱後心得

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新手上路

(2010-09-19)

李雪岩

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Department of Communication and Technology

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傳播與科技學系

通過閱讀喀報的往期內容對喀報進行更深一步的熟知、瞭解，將對喀報的認識與心得體會通過文字進行表述，思考過程中還要注意結合大陸的相關校園媒體進行對比分析。

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新手上路!

(2010-09-19)

徐子晴

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Department of Communication and Technology

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傳播與科技學系

喀報心得感想~

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新手上路

(2010-09-19)

林映綺

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Department of Communication and Technology

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傳播與科技學系

大學中最令人驚恐的電子報!!

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新手上路

(2010-09-19)

呂靜宜

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Department of Communication and Technology

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傳播與科技學系

我不想要上路~~

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新手上路

(2010-09-19)

彭婉婷

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Department of Communication and Technology

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傳播與科技學系

看喀報網頁後的心得

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新手上路

(2010-09-19)

陳文玲

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Department of Communication and Technology

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傳播與科技學系

將探照燈投注在小事件，但卻是值得公眾關切的議題，擁有一個對新聞業的赤子之心，還有要一顆堅強的心臟，並堅持做對的事情。

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電子報

(2010-09-19)

陳羽涵

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Department of Communication and Technology

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傳播與科技學系

新手上路

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心得

(2010-09-19)

歐人瑋

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Department of Communication and Technology

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傳播與科技學系

心得

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新手上路

(2010-09-19)

張瑜庭

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Department of Communication and Technology

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傳播與科技學系

閱讀喀報心得

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新手上路

(2010-09-19)

劉芮菁

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Department of Communication and Technology

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傳播與科技學系

兵來將擋，水來土掩，該面對的就份力一搏吧！

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喀報完美不完美？

(2010-09-19)

黃萱如

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Department of Communication and Technology

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傳播與科技學系

喀報系統不能稱得上是最完美的系統，因為它還在持續進步中，但仍然會有許多美麗的作品誕生，除了在這個電子報裡觀賞到包羅萬象的作品，也會發現一些遺留的缺失，但卻不會折損學生們在喀報中展現的生命熱度和態度。

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新手上路

(2010-09-19)

林書羽

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Department of Communication and Technology

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傳播與科技學系

電子報，我來了!!

Browsing by Issue Date, starting with "2010-09-17"