University of Bristol, UK and Radboud University, Netherlands

报告人简介：

Nigel Hussey has been full professor since 2006, initially at the University of Bristol then from 2013 at Radboud University. From 2013 until 2018, he also served as director of the High Field Magnet Laboratory. His research focuses on precision measurements of the transport properties of exotic, low-dimensional metals and superconductors in high magnetic fields. He is credited with the first experimental determination of the full Fermi surface of a high temperature superconductor, and the discovery of the strange metallic state. In recognition of these discoveries, he has been a recipient of the Charles Vernon Boys medal (now the Henry Moseley medal) from the Institute of Physics, the inaugural Brian Pippard superconductivity prize and a Royal Society Wolfson Research Merit award. He is also an elected Fellow of the Institute of Physics. In 2019, Hussey received an ERC Advanced grant.

报告摘要：

In conventional superconductors, one of the key parameters fixing the robustness of the superconductivity is the electron–phonon coupling strength λ. This in turn is closely related to λtr, the parameter that defines the transport scattering rate associated with the linear-in-temperature resistivity that is characteristic of a normal metal. This link between the coefficient of the T-linear resistivity α and the superconducting transition temperature Tc is enshrined in the old adage; ‘‘good metals make bad superconductors”. In certain unconventional superconductors, including the high-Tc cuprates, a similar correlation exists, albeit with a T-linear resistivity that extends to anomalously low temperatures indicative of a unconventional or ‘strange’ metal. Despite this complication, the search for an associated λ has been prolonged and intense. In this talk, I will present a series of electrical transport studies of both electron- and hole-doped cuprates, carried out under intense magnetic fields, that reveal two key findings about the strange metal and its link with superconductivity. On the electron-doped side, we have succeeded to identify the relevant λ as well as its origin. On the hole-doped side, however, their magneto-transport properties suggest an altogether different origin for the T-linear resistivity (i.e. one that is not related to scattering off a bosonic bath) and, in turn, an entirely new paradigm for high-Tc superconductivity.

邀请人：金魁（8264 9729）

联系人：胡颖（8264 9361）

地点：中国科学院物理研究所M楼236会议室