Large Dynamical Fluctuations in the Microwave Conductivity of YBa2Cu3O7- delta above Tc.
Large Dynamical Fluctuations in the Microwave Conductivity of YBa2Cu3O7- delta above Tc.
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YBa2Cu3O7-δ 的微波电导率在 Tc 之上的大动态波动。
DOI：
10.1103/physrevlett.77.4438
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发表时间：
1996
影响因子：
8.6
通讯作者：
Anlage
中科院分区：
文献类型：
--
作者：
Booth;Wu;Qadri;Skelton;Osofsky;Piqué;Anlage
本文系统地研究了YBa 2Cu 3 O 7− δ薄膜的动态涨落效应对T_2Tc的影响。我们的测量直接产生一个动态临界指数z在2.3-3.0的范围内，和波动寿命τ fl，这比高斯理论预测的更快地发散，从上面的温度接近Tc，独立于样品质量。此外，涨落电导率σ fl的温度和频率依赖性在Tc以上1- 2K范围内均表现出标度行为，并可折叠到同一普适曲线上.
We report a systematic investigation of dynamical fluctuation effects in the frequency-dependent microwave conductivity (45 MHz–45 GHz) of YBa 2 Cu 3 O 7− δ thin films for T≳ T c. Our measurements directly yield a dynamical critical exponent z in the range 2.3–3.0, and the fluctuation lifetime τ fl, which diverges more quickly than Gaussian theory predicts as the temperature approaches T c from above, independent of sample quality. In addition, both the temperature and the frequency dependence of the fluctuation conductivity σ fl exhibit scaling behavior for temperatures 1–2 K above T c, and can be collapsed onto the same universal curve.