2025/01/04 by T. V. Ramakrishnan, Ramakrishnan, T. V.
Physics and Astronomy · #FOS: Physical sciences #Physics of Superconductivity and Magnetism #Quantum Physics (quant-ph) #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.2501.02351
openalex publication_date 2025/01/04 · openalex created_date 2025/01/08 · openalex updated_date 2026/07/28
I present a selection of experimental results on metallic cuprates, both above the superconducting transition temperature Tc (often called the strange metal state) and in the superconducting state. It highlights this still poorly understood part of the physical world. After an introduction, I talk briefly about the pseudogap regime and about the unusual linear resistivity phenomenon. Several empirical correlations between observed quantities are mentioned, e.g. Tc and superfluid density (Uemura), Tc and next nearest neighbour hopping, slope of the linear resistivity and Tc. In the belief that a comprehensive explanation may need an understanding of the extremely strongly correlated metal, a few initial steps in this direction are outlined.