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arXiv 1207.2879cond-mat.supr-con
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高温超导体超导序出现的实时测量

Real time measurement of the emergence of superconducting order in a high temperature superconductor

I. Madan, P. Kusar, V. V. Baranov, M. Lu-Dac, T. Mertelj, V. V. Kabanov, D. Mihailovic

摘要:

在与单粒子激发的涨落时间尺度相当的时间尺度上,系统通过破环跃迁快速演化,其行为可能与受控的近遍历条件下的行为非常不同。具有高时间分辨率的实时调查可能会揭示新的见解,通过过渡,在静态实验中不可用的顺序。我们提出了一个调查的系统轨迹,通过正常到超导体的过渡,在原型高温超导铜氧化物中,这种情况发生。使用多脉冲飞秒光谱技术,我们测量系统的轨迹和时间演化的单粒子激发通过过渡在La $_{1.9}$ Sr $_{0.1}$ CuO $_{4}$和比较的数据与模拟的基础上的时间依赖的金斯堡-朗道理论,使用激光激发通量作为一个可调参数控制淬火条件在实验和理论。的比较揭示了存在显着的超导波动之前的过渡在短时间尺度上。把超导涨落作为超导序生长的种子,我们可以得到理论与实验的满意的一致。值得注意的是,赝能隙激发显然在这个过程中没有发挥作用。

英文摘要:

Systems which rapidly evolve through symmetry-breaking transitions on timescales comparable to the fluctuation timescale of the single-particle excitations may behave very differently than under controlled near-ergodic conditions. A real-time investigation with high temporal resolution may reveal new insights into the ordering through the transition that are not available in static experiments. We present an investigation of the system trajectory through a normal-to-superconductor transition in a prototype high-temperature superconducting cuprate in which such a situation occurs. Using a multiple pulse femtosecond spectroscopy technique we measure the system trajectory and time-evolution of the single-particle excitations through the transition in La$_{1.9}$Sr$_{0.1}$CuO$_{4}$ and compare the data to a simulation based on time-dependent Ginzburg-Landau theory, using laser excitation fluence as an adjustable parameter controlling the quench conditions in both experiment and theory. The comparison reveals the presence of significant superconducting fluctuations which precede the transition on short timescales. By including superconducting fluctuations as a seed for the growth of superconducting order we can obtain a satisfactory agreement of the theory with the experiment. Remarkably, the pseudogap excitations apparently play no role in this process.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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