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| 飞秒瞬态反射谱研究YBa2Cu3Ｏ７－δ费密面变化与电声子耦合 |
| 熊光成, 邹英华, 夏宗炬, 袁平, 连贵君, 李洁 |
| 北京大学人工微结构与介观物理国家重点实验室 |
| THE RELATIVE FERMI LEVEL POSITION AND THE ELECTRON-PHONON COUPLING OF YBa2Cu3Ｏ７－δ STUDIED BY FEMTOSECOND TRANSIENT REFLECTIVITY |
| XIONG GUANG-CHENG, ZOU YING-HUA, XIA ZONG-JU, YUAN PING, LIAN GUI-JUN, LI JIE |
| 北京大学人工微结构与介观物理国家重点实验室 |
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摘要： 利用飞秒脉冲激光与泵浦－探测技术测量了ＹＢａ2Ｃｕ3Ｏ７－δ（其中δ＝０．０，０．１，０．４，０．８）外延薄膜的瞬态反射率改变随时间变化曲线。由于氧含量的不同使得样品瞬态反射率改变随时间变化曲线有很大差异。瞬态反射率改变随时间变化的曲线符号变化可以理解为氧含量的变化改变了样品费密面附近的能带结构。对实验数据的拟合表明δ＝0．４的样品电声子耦合远弱于高Ｔcδ＝０的样品。
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Abstract： The femtosecond pulsed laser and pump-probe method have been used to measure the transient change of reflectivity of YBa2Cu3Ｏ７－δ(δ=0.0, 0.1, 0.4 and 0.8) thin films. From the experimental curves the transient changes are found to be very different for samples with different oxygen content. The sign of the changes can be reversed as decreasing the oxygen content. It may be attributed to the changes of energy band structure near the Fermi level. After fitting the experimental data, we reveal that the electron-phonon coupling in the sample of δ=0.4 is much weaker than high Tc(δ=0.0) sample.
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收稿日期: 1993-10-04
出版日期: 1994-11-20
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| 引用本文: |
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熊光成,邹英华,夏宗炬 等 . 飞秒瞬态反射谱研究YBa2Cu3Ｏ７－δ费密面变化与电声子耦合. 物理学报, 1994, 43(11): 1865.
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| Cite this article: |
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XIONG GUANG-CHENG,ZOU YING-HUA,XIA ZONG-JU et al. THE RELATIVE FERMI LEVEL POSITION AND THE ELECTRON-PHONON COUPLING OF YBa2Cu3Ｏ７－δ STUDIED BY FEMTOSECOND TRANSIENT REFLECTIVITY. Acta Phys. Sin., 1994, 43(11): 1860-1865.
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| URL: |
| http://wulixb.iphy.ac.cn/CN/Y1994/V43/I11/1860 |
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1994, Vol. 43 
