Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU
Dr Paul Goddard, Warwick University
Angle-dependent magnetoresistance (AMR) is a uniquely valuable technique for determining the geometry of the bulk Fermi surface of layered materials. I will explain the details of how this method works, discuss the phase diagram of the high-temperature cuprate superconductors and the associated unresolved questions, and show how AMR has been used in the past to understand the electronic properties of this important class of materials. I will report on more recent AMR data taken near the so-called critical doping. These results clearly show that a reconstruction of the Fermi surface occurs at the pseudo-gap phase boundary, which has repercussions for the origin of the superconductivity in these materials [1]. The data also shed light on the linear-in-temperature resistivity observed in cuprate superconductors [2].
[1] Y Fang et al. Nature Physics 18, 558 (2022)
[2] G. Grissonnanche et al. Nature 595, 667 (2021)