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

Sarkar, Tarapada; Mandal, P. R.; Poniatowski, N. R.; Chan, Mun Keat; Greene, Richard L.

doi:10.1126/sciadv.aav6753

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

Journal Article · Fri May 17 00:00:00 EDT 2019 · Science Advances

DOI:https://doi.org/10.1126/sciadv.aav6753· OSTI ID:1532728

^[1]; Mandal, P. R. ^[1]; Poniatowski, N. R. ^[1];

^[2];

^[1]

Univ. of Maryland, College Park, MD (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

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_xCuO₄ 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.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1532728

Report Number(s):: LA-UR-19-24360

Journal Information:: Science Advances, Vol. 5, Issue 5; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 23 works

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