Some Controversial Issues in High Tc Superconductivity - a Specific Heat Perpective
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If you have a question about this talk, please contact Michael Sutherland.
After 20 years of study many important issues relating to high-Tc cuprate
superconductivity (SC) remain unresolved. This is largely due to a lack of
agreement on the nature of the normal state from which SC develops, and in
particular the origin of the normal state pseudogap at low hole doping (p).
From our specific heat measurements we find a universal progression with p
from insulator to overdoped metal via a states-non-conserving and
T-independent pseudogap in the qp DOS . This gap shrinks as new spectral
weight (~ 1 state per doped hole) appears near EF and closes abruptly close
to optimal doping accompanied by a striking increase in SC condensation
energy. These features are not compatible with theories of the pseudogap in
terms of a competing order parameter, precursor SC fluctuations or a spinon
gap in spin-charge separation theories.
This talk is part of the Quantum Matter Seminar series.
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