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Category Archives: Superconductivity
Silsbee rule and other properties in superconductors
Silsbee rule: An important result of the existence of critical magnetic field is that there is also critical strength of current Ic flowing in the superconductor. Exceeding this limit also causes the disturbance of superconductivity. To derive the relation between … Continue reading
Applications of superconductors
Superconductors are useful in a number of following applications: 1. Generation and transmission of electric power. 2. Medical diagnosis 3. Electromagnets (superconducting magnets): – The type 2 superconducting wires are wound in the form of solenoids to generate strong magnetic … Continue reading
London equations: explanation of flux penetration
As we have already derived the London equations in last article. Now let us explain the flux penetration (Meissner effect) from London equations: To explain Meissner effect from London equations consider the differential form of Ampere’s circuital law: del x … Continue reading
Posted in Superconductivity
Tagged definition london penetration depth, explanation of meissner effect using london equations, flux penetration and london equations, importance helmholtz theorem, london penetration depth, london penetration depth dependence on temperature, meissner effect and london equations, relation london penetration depth with temperature, significance of gradient, what is london penetration depth
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London equations in superconductors: derivation and discussion
London Equations: As discussed in the Meissner effect that one of the conditions of the superconducting state is that Magnetic flux density (B) = 0 inside the superconductors that is the magnetic flux cannot penetrate inside the superconductor. But experimentally … Continue reading
Posted in Superconductivity
Tagged importance london equations, london equations, london equations derivation, london first equation, london first equation derivation, london second equation, london second equation derivation, meissner effect and london equation, significance london equations, who derived london equations
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Type I and Type II superconductors
Depending upon their behavior in an external magnetic field, superconductors are divided into two types: a) Type I superconductors and b) Type II superconductors Let us discuss them one by one: 1) Type I superconductors: a). Type I superconductors are … Continue reading
Posted in Superconductivity
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BCS Theory of Superconductivity
A qualitative discussion of a successful theory of superconductivity was given by Bardeen, Copper and Schrieffer, known as BCS theory after the initials of their names. This theory accounts for all properties of superconductors. (a) Electron –phonon Interaction.