Unusual behavior of cuprates explained by heterogeneous charge localization

Pelc, Damjan and Popčević, Petar and Požek, Miroslav and Greven, M. and Barišić, Neven (2019) Unusual behavior of cuprates explained by heterogeneous charge localization. Science Advances, 5 (1). eaau4538-11. ISSN 2375-2548

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Abstract

The discovery of high-temperature superconductivity in cuprates ranks among the major scientific milestones of the past half century, yet pivotal questions regarding the complex phase diagram of these materials remain unanswered. Generally thought of as doped charge-transfer insulators, these complex oxides exhibit pseudogap, strange-metal, superconducting, and Fermi liquid behavior with increasing hole-dopant concentration. Motivated by recent experimental observations, here we introduce a phenomenological model wherein exactly one hole per planar copper-oxygen unit is delocalized with increasing doping and temperature. The model is percolative in nature, with parameters that are highly consistent with experiments. It comprehensively captures key unconventional experimental results, including the temperature and the doping dependence of the pseudogap phenomenon, the strange-metal linear temperature dependence of the planar resistivity, and the doping dependence of the superfluid density. The success and simplicity of the model greatly demystify the cuprate phase diagram and point to a local superconducting pairing mechanism.

Item Type: Article
Keywords: cuprate superconductors, phase diagram, charge localization
Date: 2019
Number of Pages: 11
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).
Divisions: Faculty of Science > Department of Physics
Project code: ERC Consolidator Grant no. 725521, IP-2016-06-7258, IP-2018-01-2970
Publisher: American Association for the Advancement of Science
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 26 Mar 2019 10:10
Last Modified: 26 Mar 2019 11:19
URI: http://digre.pmf.unizg.hr/id/eprint/5893

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