Electronic diffusion in a normal state of high-Tc cuprate YBa$_2$Cu$_3$O$_{6+x}$

Kokalj, Jure (author)

The bad metallic phase with resistivity above the Mott–Ioffe–Regel (MIR) limit, which appears also in cuprate superconductors, was recently understood by cold atom and computer simulations of the Hubbard model via charge susceptibility and charge diffusion constant. However, since reliable simulations can be typically done only at temperatures above the experimental temperatures, the question for cuprate superconductors is still open. This paper addresses this question by resorting to heat transport, which allows for the estimate of electronic diffusion and it further combines it with the resistivity to estimate the charge susceptibility. The doping and temperature dependencies of diffusion constant and charge susceptibilities are shown and discussed for two samples of YBa$_2$Cu$_3$O$_{6+x}$. Results indicate strongly incoherent transport, mean free path corresponding to the MIR limit for the underdoped sample at temperatures above ~200 K and significant effect of the charge susceptibility on the resistivity.

• Language: English
• Keywords: Hubbard model, diffusion, superconductors, superconducting cuprates, electronic transport, heat conductivity
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2024
• Number of pages: 3 str.
• Numbering: Vol. 121, no. 12, art. e2322670121
• PID: 20.500.12556/RUL-164644
• UDC: 53
• ISSN on article: 1091-6490
• DOI: 10.1073/pnas.2322670121
• COBISS.SI-ID: 188945923
• Publication date in RUL: 06.11.2024

Record is a part of a journal

• Title: Proceedings of the National Academy of Sciences of the United States of America
• Shortened title: Proc. Natl. Acad. USA
• Publisher: National Academy of Sciences
• ISSN: 1091-6490
• COBISS.SI-ID: 2318612

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: superprevodniki, Hubbardov model, limita Mott–Ioffe–Regel, difuzije

Projects

• Funder: ARIS - Slovenian Research and Innovation Agency
• Project number: P1-0044
• Name: Teorija trdnih snovi in statistična fizika