Frequency and field variation of vortex dynamics in YBa2Cu3O7- delta.
Frequency and field variation of vortex dynamics in YBa2Cu3O7- delta.
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YBa2Cu3O7- δ 中涡动力学的频率和场变化。
DOI：
10.1103/physrevlett.75.525
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发表时间：
1995
影响因子：
8.6
通讯作者：
Anlage
中科院分区：
文献类型：
--
作者：
Wu;Booth;Anlage
我们测量了复交流电阻率 $\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{\ensuremath{\rho}}$ $(\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}{\ensuremath{\rho}}_{1}+i{\ensuremath{\rho}}_{2})$ ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$频率范围为45 MHz至50 GHz的薄膜。由$\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{\ensuremath{\rho}}$在零场下获得的微波电导率${\ensuremath{\sigma}}_{1}$在${T}_{c}$附近表现出相当大的频率依赖性，表明波动和不均匀效应在高频下显着减小。在施加直流磁场的情况下，涡旋动力学以交叉频率 ${f}_{x}$ 变化，显示低频 $(fl{f}_{x})$ 下的缩放行为 ${\ensuremath{\rho}}_{i}\ensuremath{\propto}{\ensuremath{\omega}}^{{\ensuremath{\alpha}}_{i}}$ 和高频下的平均场行为$\left(fg{f}_{x}\right)$。
We have measured the complex ac resistivity $\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{\ensuremath{\rho}}$ $(\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}{\ensuremath{\rho}}_{1}+i{\ensuremath{\rho}}_{2})$ of ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ thin films in the frequency range of 45 MHz to 50 GHz. The microwave conductivity ${\ensuremath{\sigma}}_{1}$, obtained from $\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{\ensuremath{\rho}}$ in zero field, manifests considerable frequency dependence in the vicinity of ${T}_{c}$, showing that fluctuation and inhomogeneity effects are significantly reduced at high frequencies. With an applied dc magnetic field, the vortex dynamics changes at a crossover frequency ${f}_{x}$, showing scaling behavior ${\ensuremath{\rho}}_{i}\ensuremath{\propto}{\ensuremath{\omega}}^{{\ensuremath{\alpha}}_{i}}$ at low frequencies $(fl{f}_{x})$ and mean-field behavior at high frequencies $\left(fg{f}_{x}\right)$.