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Title: Correlation between scale-invariant normal-state resistivity and superconductivity in an electron-doped cuprate

Abstract

An understanding of the normal state in the high-temperature superconducting cuprates is crucial to the ultimate understanding of the long-standing problem of the origin of the superconductivity itself. This so-called “strange metal” state is thought to be associated with a quantum critical point (QCP) hidden beneath the superconductivity. In electron-doped cuprates—in contrast to hole-doped cuprates—it is possible to access the normal state at very low temperatures and low magnetic fields to study this putative QCP and to probe the T → 0 K state of these materials. We report measurements of the low-temperature normal-state magnetoresistance (MR) of the n-type cuprate system La 2–xCe xCuO 4 and find that it is characterized by a linear-in-field behavior, which follows a scaling relation with applied field and temperature, for doping ( x) above the putative QCP ( x = 0.14). The magnitude of the unconventional linear MR decreases as T c decreases and goes to zero at the end of the superconducting dome ( x ~ 0.175) above which a conventional quadratic MR is found. These results show that there is a strong correlation between the quantum critical excitations of the strange metal state and the high- T c superconductivity.

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [2]; ORCiD logo [1]
  1. Univ. of Maryland, College Park, MD (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1532728
Report Number(s):
LA-UR-19-24360
Journal ID: ISSN 2375-2548
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 5; Journal Issue: 5; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
High Magnetic Field Science

Citation Formats

Sarkar, Tarapada, Mandal, P. R., Poniatowski, N. R., Chan, Mun Keat, and Greene, Richard L. Correlation between scale-invariant normal-state resistivity and superconductivity in an electron-doped cuprate. United States: N. p., 2019. Web. doi:10.1126/sciadv.aav6753.
Sarkar, Tarapada, Mandal, P. R., Poniatowski, N. R., Chan, Mun Keat, & Greene, Richard L. Correlation between scale-invariant normal-state resistivity and superconductivity in an electron-doped cuprate. United States. doi:10.1126/sciadv.aav6753.
Sarkar, Tarapada, Mandal, P. R., Poniatowski, N. R., Chan, Mun Keat, and Greene, Richard L. Fri . "Correlation between scale-invariant normal-state resistivity and superconductivity in an electron-doped cuprate". United States. doi:10.1126/sciadv.aav6753. https://www.osti.gov/servlets/purl/1532728.
@article{osti_1532728,
title = {Correlation between scale-invariant normal-state resistivity and superconductivity in an electron-doped cuprate},
author = {Sarkar, Tarapada and Mandal, P. R. and Poniatowski, N. R. and Chan, Mun Keat and Greene, Richard L.},
abstractNote = {An understanding of the normal state in the high-temperature superconducting cuprates is crucial to the ultimate understanding of the long-standing problem of the origin of the superconductivity itself. This so-called “strange metal” state is thought to be associated with a quantum critical point (QCP) hidden beneath the superconductivity. In electron-doped cuprates—in contrast to hole-doped cuprates—it is possible to access the normal state at very low temperatures and low magnetic fields to study this putative QCP and to probe the T → 0 K state of these materials. We report measurements of the low-temperature normal-state magnetoresistance (MR) of the n-type cuprate system La2–xCexCuO4 and find that it is characterized by a linear-in-field behavior, which follows a scaling relation with applied field and temperature, for doping (x) above the putative QCP (x = 0.14). The magnitude of the unconventional linear MR decreases as Tc decreases and goes to zero at the end of the superconducting dome (x ~ 0.175) above which a conventional quadratic MR is found. These results show that there is a strong correlation between the quantum critical excitations of the strange metal state and the high-Tc superconductivity.},
doi = {10.1126/sciadv.aav6753},
journal = {Science Advances},
number = 5,
volume = 5,
place = {United States},
year = {2019},
month = {5}
}

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