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 La2-x Ce x CuO4 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.

journal_name

Sci Adv

journal_title

Science advances

authors

Sarkar T,Mandal PR,Poniatowski NR,Chan MK,Greene RL

doi

10.1126/sciadv.aav6753

subject

Has Abstract

pub_date

2019-05-17 00:00:00

pages

eaav6753

issue

5

issn

2375-2548

pii

aav6753

journal_volume

5

pub_type

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