2020/11/25 by Nikola Maksimovic, Maksimovic, Nikola, Tessa Cookmeyer +23
Materials Science · Physics and Astronomy · #Advanced Chemical Physics Studies #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.2011.12951
openalex publication_date 2020/11/25 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
The presence of a quantum critical point separating two distinct\nzero-temperature phases is thought to underlie the `strange' metal state of\nmany high-temperature superconductors. The nature of this quantum critical\npoint, as well as a description of the resulting strange metal, are central\nopen problems in condensed matter physics. In large part, the controversy stems\nfrom the lack of a clear broken symmetry to characterize the critical phase\ntransition, and this challenge is no clearer than in the example of the\nunconventional superconductor CeCoIn5. Through Hall effect and Fermi surface\nmeasurements of CeCoIn5, in comparison to ab initio calculations, we find\nevidence for a critical point that connects two Fermi surfaces with different\nvolumes without apparent symmetry-breaking, indicating the presence of a\ntransition that involves an abrupt localization of one sector of the charge\ndegrees of freedom. We present a model for the anomalous electrical Hall\nresistivity of this material based on the conductivity of valence charge\nfluctuations.\n