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Materials displaying this phenomenon expel their magnetic field in the Meissner effect. For 10 points each:
[10e] Name this phenomenon which a 2023 preprint falsely claimed LK-99 was able to display at room temperature.
ANSWER: superconductivity [or superconductors]
[10m] The characteristic coherence length was introduced in this macroscopic theory of superconductivity. The central equations of this theory are used to compute the complex order parameter.
ANSWER: Ginzburg–Landau theory [or Landau–Ginzburg theory; accept Ginzburg–Landau equations; reject “Landau theory”]
[10h] Whether a superconductor is Type I or II depends on the value of the ratio of coherence length to penetration depth, since it determines the sign of this quantity. For positive values of this quantity, boundaries are unfavorable, giving rise to Type I superconductors.
ANSWER: surface energy [accept sigma sub ns; prompt on energy; prompt on sigma]
<Physics>
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Conversion

TeamOpponentPart 1Part 2Part 3TotalParts
Chicago AColumbia A1010020EM
Chicago BToronto C100010E
Columbia BWaterloo B100010E
FloridaWUSTL A100010E
Illinois ANYU100010E
Illinois BIowa State100010E
IndianaMIT1010020EM
Johns HopkinsStanford1010020EM
LSEMaryland100010E
NorthwesternGeorgia State100010E
Ohio StateVirginia Tech100010E
OttawaHarvard100010E
RutgersRIT100010E
TexasGeorgia Tech100010E
Toronto AArizona State100010E
Toronto BMichigan100010E
UC Berkeley ANorth Carolina B1010020EM
UC Berkeley BUCF100010E
VanderbiltWaterloo A100010E
VirginiaPenn State100010E
WUSTL BBritish Columbia100010E
Winona StateMinnesota100010E

Summary

TournamentExact Match?HeardPPBEasy %Medium %Hard %
2025 ACF NationalsYes2211.82100%18%0%