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The discovery of high-temperature superconductors in the late 1980s fundamentally altered the trajectory of condensed matter physics. Prior to this breakthrough, superconductivity was observed only at temperatures near absolute zero, requiring expensive liquid helium cooling systems that limited practical applications. The new ceramic compounds, based on copper-oxide layers, exhibited zero electrical resistance at temperatures achievable with liquid nitrogen, a far cheaper and more accessible coolant.
However, the theoretical framework for these materials remains incomplete. Unlike conventional superconductors, which are well described by BCS theory, the mechanism behind high-temperature superconductivity continues to elude a unified explanation. Some researchers propose that magnetic fluctuations in the copper-oxide planes mediate electron pairing, while others argue for a phonon-based mechanism modified by the layered crystal structure.
48 lessons. Quant and Verbal.
From foundations to advanced strategies. Structured so you know exactly what to study next.
6 full-length practice tests.
Timed. Adaptive. Scored like the real GRE.
The real GRE adapts to your performance. If you ace the first section, the second gets harder. If you struggle, it gets easier. Our mocks work the same way, with three difficulty paths and scoring calibrated to real test data.
1,200 words. 12 tiers. Spaced repetition.
Master the words that actually appear on the GRE. Organized by frequency, not alphabetically.
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We tell you why the wrong one was tempting.
After every wrong answer, you tell us what went wrong. We track your patterns over time, surface your most common mistake types, and build focused drills around your specific weaknesses.
40 trap patterns catalogued and drillable.
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6,600+ questions, 48 lessons, mock exams. All adaptive.
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- 6,600+ practice questions with personalized explanations
- 48 concept lessons across Quant and Verbal
- 6 full-length adaptive mock exams
- 1,200-word vocab system with spaced repetition
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- Error analysis and trap training
- New content added regularly
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