Flux-periodic persistent current in mesoscopic superconducting rings close to Tc.
Flux-periodic persistent current in mesoscopic superconducting rings close to Tc.
复制标题
接近 Tc 的介观超导环中的通量周期持续电流。
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
Riedel
中科院分区：
文献类型：
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作者：
von Oppen F;Riedel
We study the function-induced persistent current close to ${mathit{T}}_{mathit{c}}$ in effectively one-dimensional superconducting rings threaded by a magnetic flux ensuremath{varphi}. Using a transfer-operator approach to the Ginzburg-Landau theory we calculate the dependences of the persistent current on temperature, flux, and ${mathit{T}}_{mathit{c}}$. In agreement with a simple physical argument we find that the temperature dependence of the current amplitude is similar to that of the order-parameter fluctuations 〈ensuremath{Vert}ensuremath{Delta}${mathrm{ensuremath{Vert}}}^{2}$〉. We discuss the observability of a flux-periodic response below ${mathit{T}}_{mathit{c}}$ in view of the existence of metastable states and phase slips. Our predictions apply to experiments on superconductors whose ${mathit{T}}_{mathit{c}}$ is larger than the correlation energy ${mathit{E}}_{mathit{c}}$.
We study the function-induced persistent current close to ${mathit{T}}_{mathit{c}}$ in effectively one-dimensional superconducting rings threaded by a magnetic flux ensuremath{varphi}. Using a transfer-operator approach to the Ginzburg-Landau theory we calculate the dependences of the persistent current on temperature, flux, and ${mathit{T}}_{mathit{c}}$. In agreement with a simple physical argument we find that the temperature dependence of the current amplitude is similar to that of the order-parameter fluctuations 〈ensuremath{Vert}ensuremath{Delta}${mathrm{ensuremath{Vert}}}^{2}$〉. We discuss the observability of a flux-periodic response below ${mathit{T}}_{mathit{c}}$ in view of the existence of metastable states and phase slips. Our predictions apply to experiments on superconductors whose ${mathit{T}}_{mathit{c}}$ is larger than the correlation energy ${mathit{E}}_{mathit{c}}$.