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Tunneling observation of phonon contribution to the Cooper pairing in high-Tc superconductors

机译:在高TC超导体中对Cooper配对的隧道贡献观察

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Improved tunneling spectroscopy was carried out on high-T$-c$/ BSCCO(2212) single crystal, and it provided us a reflection spectrum of the quasi-particle that mediates the strong Cooper pairing. The point contact junction enabled us to observe significant fine structure spectrum beyond the gap edge up to 0.2 eV. The spectrum peaks both in positive and negative bias ranges were found to be in a good one-to-one correspondence to the phonon density-of-states peaks at energy level $HBAR approximately ega$-i$/ reported by the neutron scattering experiment. The significant peaks at higher energies could be also assigned by n$epsilon$-O$/ $PLU $HBAR approximately ega@i (n equals 0.1.2) where $epsilon$-O$/ is the breathing mode energy. Numerical computation in terms of the Eliashberg gap equation was carried out and the electron-phonon coupling intensity function $alpha$+2$/F(approximately ega@) was elucidated. Most of the peak modes were attributed to the optical phonons due to oxygen oscillations in and around the (CuO$-2$/)$-n$/ plane, wherein the superconducting electronic state takes place. Consequently it turns out that the breathing mode has an essential role in the high-T$-c$/ superconductivity in the perovskite type-oxides.
机译:改进的隧道光谱在高T $ -C $ / BSCCO(2212)单晶上进行,并为我们提供了介导强铜配对的准粒子的反射谱。点联络结使我们能够观察到超出间隙边缘的显着细结构光谱,高达0.2eV。发现正面和负偏压范围内的频谱峰是在能量水平$ HBAR的态度峰值峰值的良好一对一对应于EGA $ -i $ /报告的中子散射实验。在较高的能量上的显着峰值也可以由n $ epsilon $ -o $ / $ plu $ hbar jab jea @ i(n等于0.1.2),其中$ epsilon $ -o $ /是呼吸模式能量。执行ELIASHBERG间隙方程方面的数值计算,阐明了电子 - 声子耦合强度函数$ alpha $ + 2 $ / f(约为ega @)。由于(CUO $ -2 $ /)$ /平面周围和周围的氧振荡,大多数峰模式归因于光学声子,其中发生超导电子状态。因此,事实证明,呼吸模式在钙钛矿型氧化物中的高T $ -C $ /超导中具有重要作用。

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