# London penetration depth

﻿
London penetration depth

In superconductivity, London penetration depth (usually denoted as $lambda,$ or $lambda_L,$) characterizes the typical distance to which a weak magnetic field penetrates into a superconductor.

Typical values of $lambda_L,$ are between 50 and 500 nm. Deep inside a superconductor the magnetic field is zero (Meissner effect).

For example, if one considers a superconducting semi-space at $x>0,$, and weak external magnetic field $B_0,$ applied along $z$-direction in the empty space $x<0,$, then inside the superconductor the magnetic field is given by :$B\left(x\right)=B_0expleft\left(-frac\left\{x\right\}\left\{lambda_L\right\} ight\right),$i.e. $lambda_L,$ is the distance across which magnetic field becomes$e,$ times weaker. The above expression follows from the solution of the London equation with proper boundary conditions.

* Charles Kittel, "Introduction to Solid State Physics", 8-th edition, John Wiley & Sons, (2004), ISBN 978-0471415268, pages 262 (Meissner Effect) and 273 (London equations).

ee also

London equations

Wikimedia Foundation. 2010.

### Look at other dictionaries:

• London penetration depth — Londono skverbties gylis statusas T sritis Standartizacija ir metrologija apibrėžtis Apibrėžtį žr. priede. priedas( ai) Grafinis formatas atitikmenys: angl. London penetration depth vok. London Tiefe, f rus. лондоновская глубина проникновения, f… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

• London penetration depth — Londono skverbties gylis statusas T sritis fizika atitikmenys: angl. London penetration depth vok. London Tiefe, f rus. лондоновская глубина проникновения, f pranc. profondeur de pénétration de London, f …   Fizikos terminų žodynas

• Josephson penetration depth — In superconductivity, Josephson penetration depth characterizes the typical length on which an externally applied magnetic field penetrates into the long Josephson junction. Josephson penetration depth is usually denoted as lambda J and is given… …   Wikipedia

• London equations — The London equations, developed by brothers Fritz and Heinz London in 1935, [cite journal last= London first= F. coauthors= H. London month= March title= The Electromagnetic Equations of the Supraconductor journal= Proc. Roy. Soc. (London) volume …   Wikipedia

• London-Tiefe — Londono skverbties gylis statusas T sritis Standartizacija ir metrologija apibrėžtis Apibrėžtį žr. priede. priedas( ai) Grafinis formatas atitikmenys: angl. London penetration depth vok. London Tiefe, f rus. лондоновская глубина проникновения, f… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

• London-Tiefe — Londono skverbties gylis statusas T sritis fizika atitikmenys: angl. London penetration depth vok. London Tiefe, f rus. лондоновская глубина проникновения, f pranc. profondeur de pénétration de London, f …   Fizikos terminų žodynas

• profondeur de pénétration de London — Londono skverbties gylis statusas T sritis Standartizacija ir metrologija apibrėžtis Apibrėžtį žr. priede. priedas( ai) Grafinis formatas atitikmenys: angl. London penetration depth vok. London Tiefe, f rus. лондоновская глубина проникновения, f… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

• profondeur de pénétration de London — Londono skverbties gylis statusas T sritis fizika atitikmenys: angl. London penetration depth vok. London Tiefe, f rus. лондоновская глубина проникновения, f pranc. profondeur de pénétration de London, f …   Fizikos terminų žodynas

• Peaceful Penetration — was an Australian tactic (though also used by the New Zealanders), which was a cross between trench raiding and patrolling. The aim was similar to trench raiding (namely, to gather prisoners, conduct reconnaissance, and to dominate no mans land) …   Wikipedia

• Meissner effect — Diagram of the Meissner effect. Magnetic field lines, represented as arrows, are excluded from a superconductor when it is below its critical temperature. The Meissner effect is the expulsion of a magnetic field from a superconductor during its… …   Wikipedia