Factorial moment generating function - Revision history

2001:6B0:1:1290:6869:1958:D92D:70FD at 10:38, 3 March 2014

2014-03-03T10:38:30Z

← Older revision		Revision as of 12:38, 3 March 2014
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	~~In [[superconductivity]], the '''superconducting coherence length''', usually denoted as <math>\xi</math> (Greek lowercase ''xi''),~~ is ~~the characteristic exponent of the variations of the density of superconducting component.~~		Andera is what you can contact her but she never really liked that title. To play lacross is something he would never give up. Credit authorising is exactly where my main earnings arrives from. My spouse and I reside in Mississippi and I love every day living right here.<br><br>My weblog email psychic readings ([http://gcjcteam.org/index.php?mid=etc_video&document_srl=696611&sort_index=regdate&order_type=desc similar resource site])

	~~In some special [[limiting case]]s, 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:<ref name=Tinkham>{{cite book\|last=Tinkham\|first=M~~.~~\|title=Introduction to Superconductivity, Second Edition\|publisher=McGraw-Hill\|location=New York, NY\|year=1996\|isbn=0486435032}}</ref>~~
	~~:<math> \xi = \sqrt{\frac{\hbar^2}{2 m \|\alpha\|}}</math>~~
	~~while~~ in ~~BCS theory~~
	~~:<math> \xi = \frac{2\hbar v_f}{\pi \Delta}</math>~~
	~~where <math>\hbar</math> is the [[reduced Planck constant]], <math>m</math> is the mass of a Cooper pair (twice the [[electron mass]]), <math>v_f</math> is the Fermi velocity,~~ and ~~<math>\Delta</math> 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 ~~superconductor]]s are those with 0 < ''κ'' < 1/√2, and [[type-II superconductor]]s are those with ''κ'' > 1/√2~~.

	~~For temperatures ''T'' near the superconducting critical temperature ''T~~<~~sub~~>c<~~/sub~~>~~'', ''ξ~~(~~T) &prop; (1-T~~/~~T<sub>c<~~/~~sub>)<sup>-1<~~/~~sup>''~~.

	==~~See also~~==
	* [[Ginzburg-Landau theory]] of superconductivity
	* [[BCS theory]] of superconductivity

	~~==References==~~
	~~{{reflist}}~~

	~~{{DEFAULTSORT:Superconducting Coherence Length}}~~
	~~[[Category:Superconductivity]~~]

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2013-03-15T08:43:34Z

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← Older revision		Revision as of 10:43, 15 March 2013
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	~~Hello and welcome~~. ~~My title~~ is ~~Irwin and I totally dig that name~~. ~~To gather badges~~ is ~~what her family and her appreciate~~. ~~Her spouse and her live in Puerto Rico but she will have to move one day or another~~. ~~He utilized~~ to ~~be unemployed but now he~~ is a ~~meter reader.~~<br><br>~~Here~~ is ~~my web~~-~~site;~~ [~~http:~~//~~nuvem.tk~~/~~altergalactica~~/~~AliceedMaurermy nuvem~~.tk]		In [[superconductivity]], the '''superconducting coherence length''', usually denoted as <math>\xi</math> (Greek lowercase ''xi''), is the characteristic exponent of the variations of the density of superconducting component.

			In some special [[limiting case]]s, 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:<ref name=Tinkham>{{cite book\|last=Tinkham\|first=M.\|title=Introduction to Superconductivity, Second Edition\|publisher=McGraw-Hill\|location=New York, NY\|year=1996\|isbn=0486435032}}</ref>
			:<math> \xi = \sqrt{\frac{\hbar^2}{2 m \|\alpha\|}}</math>
			while in BCS theory
			:<math> \xi = \frac{2\hbar v_f}{\pi \Delta}</math>
			where <math>\hbar</math> is the [[reduced Planck constant]], <math>m</math> is the mass of a Cooper pair (twice the [[electron mass]]), <math>v_f</math> is the Fermi velocity, and <math>\Delta</math> 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 superconductor]]s are those with 0 < ''κ'' < 1/√2, and [[type-II superconductor]]s are those with ''κ'' > 1/√2.

			For temperatures ''T'' near the superconducting critical temperature ''T<sub>c</sub>'', ''ξ(T) &prop; (1-T/T<sub>c</sub>)<sup>-1</sup>''.

			==See also==
			* [[Ginzburg-Landau theory]] of superconductivity
			* [[BCS theory]] of superconductivity

			==References==
			{{reflist}}

			{{DEFAULTSORT:Superconducting Coherence Length}}
			[[Category:Superconductivity]]

en>BattyBot: changed {{Unreferenced}} to {{Refimprove}} & general fixes using AWB (7916)

2012-01-24T03:31:22Z

changed {{Unreferenced}} to {{Refimprove}} & general fixes using AWB (7916)

New page

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