Fluctuations in the microwave conductivity of YBa2Cu3O7- delta single crystals in zero dc magnetic field.
Fluctuations in the microwave conductivity of YBa2Cu3O7- delta single crystals in zero dc magnetic field.
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零直流磁场中 YBa2Cu3O7-δ 单晶微波电导率的波动
DOI：
10.1103/physrevb.53.2792
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
Peng
中科院分区：
文献类型：
--
作者：
Anlage;Mao;Booth;Wu;Peng
We present a quantitative analysis of finite frequency fluctuation conductivity above and below ${\mathit{T}}_{\mathit{c}}$ in cuprate superconductors in zero dc magnetic field. In a ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ crystal showing a linear in temperature increase of the penetration depth at low temperatures, we find that two-dimensional (2D) finite frequency Gaussian conductivity fluctuations above ${\mathit{T}}_{\mathit{c}}$ cross over into a slower divergence of the conductivity as ${\mathit{T}}_{\mathit{c}}$ is approached from above. We find that the critical regime above ${\mathit{T}}_{\mathit{c}}$ is less than about 0.6 K wide. At and below ${\mathit{T}}_{\mathit{c}}$, 3D fluctuations dominate the conductivity, with evidence of 3D XY critical scaling of the imaginary part of the conductivity down to 5 K below ${\mathit{T}}_{\mathit{c}}$. \textcopyright{} 1996 The American Physical Society.
We present a quantitative analysis of finite frequency fluctuation conductivity above and below ${\mathit{T}}_{\mathit{c}}$ in cuprate superconductors in zero dc magnetic field. In a ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ crystal showing a linear in temperature increase of the penetration depth at low temperatures, we find that two-dimensional (2D) finite frequency Gaussian conductivity fluctuations above ${\mathit{T}}_{\mathit{c}}$ cross over into a slower divergence of the conductivity as ${\mathit{T}}_{\mathit{c}}$ is approached from above. We find that the critical regime above ${\mathit{T}}_{\mathit{c}}$ is less than about 0.6 K wide. At and below ${\mathit{T}}_{\mathit{c}}$, 3D fluctuations dominate the conductivity, with evidence of 3D XY critical scaling of the imaginary part of the conductivity down to 5 K below ${\mathit{T}}_{\mathit{c}}$. \textcopyright{} 1996 The American Physical Society.