The Meissner effect in superconductors: emergence versus reductionism.

Area of Science:

• Condensed Matter Physics
• Superconductivity
• Electromagnetism

Background:

• The Meissner effect, the expulsion of magnetic fields from superconductors, is a fundamental phenomenon discovered in 1933.
• Conventional theories, including BCS and Ginzburg-Landau, are widely accepted to fully explain the Meissner effect through emergent properties.

Purpose of the Study:

• To review the conventional understanding of the Meissner effect and its theoretical underpinnings.
• To investigate unresolved questions regarding momentum conservation during magnetic field expulsion.
• To explore a reductionist approach involving radial charge motion to address these puzzles.

Main Methods:

• Review of existing literature on the Meissner effect and superconductivity theories.
• Analysis of arguments supporting the conventional, emergent explanation.
• Examination of a proposed reductionist model incorporating radial charge motion.

Main Results:

• Conventional theories, while successful, face challenges related to momentum conservation in the Meissner effect.
• A reductionist approach suggests radial charge motion during the transition is necessary to conserve momentum.
• This model aligns with classical plasma physics and offers explanations for momentum transfer puzzles.

Conclusions:

• The conventional explanation of the Meissner effect may be incomplete, potentially requiring additional physics.
• The presence or absence of radial charge motion has significant implications for understanding superconductivity.
• Resolving this question is crucial for advancing materials science and the search for higher critical temperature superconductors.