Why should elements and compounds with positive paramagnetic susceptibilities not be good candidates for superconductivity?

University Physics Volume 3
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ISBN:9781938168185
Author:William Moebs, Jeff Sanny
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Chapter9: Condensed Matter Physics
Section: Chapter Questions
Problem 82P: A tightly wound solenoid at 4.0 K is 50 cm long and is constructed from Nb wire of radius 1.5 mm....
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Why should elements and compounds with positive paramagnetic susceptibilities not be good candidates for superconductivity?

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Step 1

Paramagnetic materials:

These materials are categorised as those which are weekly attracted to the magnets. The atoms have the same spin mostly but not all. 

For example: Gold, copper, aluminium etc.

Magnetic Susceptibility:

Magnetic susceptibility = MH 

Here, M is the magnetization and H is the applied magnetizing field intensity.

It is dimensionless.

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