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UPSC » Daily News Analysis ‘LK-99: The Superconductor Saga & The “Smoking Gun” Problem’ : 15 January

Daily News Analysis ‘LK-99: The Superconductor Saga & The “Smoking Gun” Problem’ : 15 January

Table of Content

Why in News?

  • As of early 2026, the scientific community has moved past the initial hype of LK-99, following a series of retractions and debunking studies. The case is now studied as a classic example of the “Smoking Gun” problem, where ordinary chemical impurities mimic revolutionary physics.

LK-99: The Scientific Post-Mortem

  • The Material: A copper-doped lead-apatite mineral.
  • The Original Claim (2023): South Korean researchers claimed it was the first room-temperature, ambient-pressure superconductor, staying functional up to 127°C.
  • The “False” Evidence:
    • The Levitation Illusion: Videos of samples “levitating” were found to be diamagnetism (a common property of many materials) or ferromagnetism, rather than the Meissner Effect (where a superconductor expels all magnetic fields).
    • The Resistivity Trap: A sharp drop in electrical resistance was reported at 104°C. Scientists later discovered this was caused by an impurity Copper Sulfide  which undergoes a physical phase transition at that exact temperature.
  • Final Consensus: Pure LK-99 crystals synthesized by independent labs (like the Max Planck Institute) proved to be insulators with high resistance, not superconductors.
  • The “Smoking Gun” Problem: This term refers to when a dramatic pattern (like a sudden drop in resistance) matches a scientist’s expectation of a discovery, but is actually caused by “mundane” atomic-scale effects or impurities.