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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Superconducting coherence length ： ウィキペディア英語版 Superconducting coherence length In superconductivity, the superconducting coherence length, usually denoted as $\backslash xi$ (Greek lowercase ''xi''), is the characteristic exponent of the variations of the density of superconducting component. In some special limiting cases, for example in the weak-coupling BCS theory it is related to characteristic Cooper pair size. The superconducting coherence length is one of two parameters in the Ginzburg-Landau theory of superconductivity. It is given by: :$\backslash xi\; =\; \backslash sqrt\}$ while in BCS theory: :$\backslash xi\; =\; \backslash frac$ where $\backslash hbar$ is the reduced Planck constant, $m$ is the mass of a Cooper pair (twice the electron mass), $v\_f$ is the Fermi velocity, and $\backslash Delta$ is the superconducting energy gap. The ratio ''κ'' = ''λ/ξ'', where λ is the London penetration depth, is known as the Ginzburg–Landau parameter. Type-I superconductors are those with 0 < ''κ'' < 1/√2, and type-II superconductors are those with ''κ'' > 1/√2. For temperatures ''T'' near the superconducting critical temperature ''Tc'', ''ξ(T) ∝ (1-T/Tc)−1''. ==See also== * Ginzburg-Landau theory of superconductivity * BCS theory of superconductivity 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Superconducting coherence length」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.