Triple

Target entity: Meissner–Ochsenfeld effect
Context triple: [Robert Ochsenfeld, coDiscovered, Meissner–Ochsenfeld effect]

• A. Meissner effect chosen
  The Meissner effect is the phenomenon in which a superconductor expels magnetic fields from its interior when cooled below its critical temperature, leading to perfect diamagnetism.
• B. de Haas–van Alphen effect
  The de Haas–van Alphen effect is a quantum oscillatory phenomenon in metals where the magnetization varies periodically with applied magnetic field, allowing precise mapping of the electronic structure and Fermi surface.
• C. Ginzburg–Landau theory of superconductivity
  The Ginzburg–Landau theory of superconductivity is a phenomenological framework that describes superconductors using a complex order parameter and macroscopic equations to capture phase transitions, coherence length, and magnetic behavior.
• D. Shubnikov–de Haas effect
  The Shubnikov–de Haas effect is a quantum oscillatory phenomenon in the electrical resistance of conductors and semiconductors subjected to strong magnetic fields at low temperatures, used to probe their electronic structure and Fermi surface.
• E. Abrikosov vortices
  Abrikosov vortices are quantized magnetic flux lines that penetrate type-II superconductors in a regular lattice when exposed to magnetic fields above a critical value.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.