Spectral weight of hole-doped cuprates across the pseudogap critical point

Article Article scientifique Article Spectral weight of hole-doped cuprates across the pseudogap critical point eng 2021-11-19 2021-11-19 author Michon Bastien 0000-0002-8221-5392 892417 author Kuzmenko Alexey 0000-0001-9574-6435 135384 author Tran Michaël 0000-0003-1922-1455 565761 author Mc Elfresh Benjamin Robert 0000-0002-3044-3684 870507 author Komiya S. author Ono S. author Uchida S. author Van Der Marel Dirk 0000-0001-5266-9847 135104 043125 10.1103/PhysRevResearch.3.043125 2643-1564 https://link.aps.org/doi/10.1103/PhysRevResearch.3.043125 One of the most widely discussed features of the cuprate high-Tc superconductors is the presence of a pseudogap in the normal state. Recent transport and specific heat measurements have revealed an abrupt transition at the pseudogap critical point, denoted p∗, characterized by a drop in carrier density and a strong mass enhancement. In order to give more details about this transition at p∗, we performed low-temperature infrared spectroscopy in the normal state of cuprate superconductors La2-xSrxCuO4 (LSCO) and La1.8-xEu0.2SrxCuO4 (Eu-LSCO) for doping contents across the pseudogap critical point p∗ (from p = 0.12 to 0.24). Through the complex optical conductivity σ , we can extract the spectral weight K∗ of the narrow Drude peak due the coherent motion of the quasiparticles, and the spectral weight enclosed inside the mid-infrared (MIR) band KMIR caused by coupling of the quasiparticles to collective excitations of the many-body system. K∗ is smaller than a third of the value predicted by band calculations, and KMIR forms a dome as a function of doping. We observe a smooth doping dependence of K∗ through p∗, and demonstrate that this is consistent with the observed doping dependence of the carrier density and the mass enhancement. We argue that the superconducting dome is the result of the confluence of two opposite trends, namely the increase of the density of the quasiparticles and the decrease of their coupling to the collective excitations as a function of doping. Cuprate Superconductivity Pseudogap Spectral weight. Dewey 500.2 33 Département de physique de la matière quantique 131 false 1364 Groupe Kuzmenko 785 Groupe Van der Marel https://yareta.unige.ch/#/home/detail/826d5866-439d-45a4-b33f-4c97225275c0 Physical review research 3 4 5c6a72f8-a208-435e-992b-8cff0dbf6a67 Article (Published version) Public Article-scientifique-from-unpaywall.pdf 1315200 application/pdf CC BY openAccess Faculté des sciences / Section de physique / Département de physique de la matière quantique

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Spectral weight of hole-doped cuprates across the pseudogap critical point	Physical review research			2021	352	219

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Mc Elfresh, Benjamin Robert