In 1987, a surge in research into these materials culminated in an eight-hour marathon session of lectures dubbed the “Woodstock of physics.” For 10 points each:
[10m] Name these materials, a type of which expel magnetic fields upon surpassing their critical temperatures.
ANSWER: superconductors [accept type-II superconductors]
[10e] The excitement surrounding the Woodstock of physics centered on discoveries of superconductors that operate at relatively high values of this quantity, which can be measured in Kelvin.
ANSWER: temperature [prompt on T]
[10h] This earliest-discovered family of high-temperature superconductors is named for the four elements that its members contain. These materials have a perovskite structure with layers bounded by alternating planes and ribbons.
ANSWER: YBCOs [accept yttrium barium copper oxides]
<Lalit Maharjan, Science - Physics> ~20510~ <Editor: David Bass>