Some Controversial Issues in High Tc Superconductivity - a Specific Heat Perpective

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• Dr. John Loram (University of Cambridge)
• Wednesday 17 January 2007, 11:15-12:15
• Mott Seminar Room, Cavendish Laboratory, Department of Physics.

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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