ISSN:
1572-9605
Keywords:
London penetration depth
;
temperature dependence
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract In the framework of the electron-phonon theory of superconductivity [1], it is shown that the magnetic field penetration depthδ L increases like a certain power of temperature atT≪T c due to the low-lying excitations in the phonon spectrum. For the acoustic phonons with the density of states ∼ω 2 the penetration depth increases ∼T 5. The origin of such a high power ofT is the same as that in the case of resistivity of the normal metal: the phonon corrections to the electromagnetic vertex should be taken into account, and major terms (∼T 3) cancel, the surviving ones having a higher power ofT. The possibility of linear and quadratic terms inδ L(T) is discussed in a model of electrons interacting with two-level centers [2].
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00618221
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