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Mysteries in the superconductivity of Sr2RuO4

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Sr2RuO4 is a correlated-electron metal whose normal state is extraordinarily well-characterised, and yet the origin of its superconductivity is not known. It is known to be unconventional, and evidence is growing that the symmetry of the order parameter is d-wave, but the pairing mechanism is a mystery. In this talk, I will discuss three mysteries of the superconductivity of Sr2RuO4. Does it break time reversal symmetry? It has been thought for over 25 years that it does, but it has been difficult to obtain decisive proof. Is the gap structure simple or complicated? Why does uniaxial stress along two different axes, both of which cause the Fermi-level density of states to increase, have opposite effects?

This talk is part of the Quantum Matter Seminar series.

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