Ferromagnetic order beyond the superconducting dome in a cuprate superconductor

Tarapada Sarkar; D S Wei; J Zhang; N R Poniatowski; P R Mandal; A Kapitulnik; Richard L Greene

doi:10.1126/science.aax1581

Ferromagnetic order beyond the superconducting dome in a cuprate superconductor

Science. 2020 May 1;368(6490):532-534. doi: 10.1126/science.aax1581.

Authors

Tarapada Sarkar¹, D S Wei^{2

3}, J Zhang⁴, N R Poniatowski¹, P R Mandal¹, A Kapitulnik^{2

3

5

6}, Richard L Greene⁷

Affiliations

¹ Maryland Quantum Materials Center and Department of Physics, University of Maryland, College Park, MD 20742, USA.
² Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305, USA.
³ Department of Applied Physics, Stanford University, Stanford, CA 94305, USA.
⁴ State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, People's Republic of China.
⁵ Department of Physics, Stanford University, Stanford, CA 94305, USA.
⁶ Stanford Institute for Materials and Energy Sciences (SIMES), SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.
⁷ Maryland Quantum Materials Center and Department of Physics, University of Maryland, College Park, MD 20742, USA. rickg@umd.edu.

PMID: 32355032
DOI: 10.1126/science.aax1581

Abstract

According to conventional wisdom, the extraordinary properties of the cuprate high-temperature superconductors arise from doping a strongly correlated antiferromagnetic insulator. The highly overdoped cuprates-whose doping lies beyond the dome of superconductivity-are considered to be conventional Fermi liquid metals. We report the emergence of itinerant ferromagnetic order below 4 kelvin for doping beyond the superconducting dome in thin films of electron-doped La_2- _x Ce _x CuO₄ (LCCO). The existence of this ferromagnetic order is evidenced by negative, anisotropic, and hysteretic magnetoresistance, hysteretic magnetization, and the polar Kerr effect, all of which are standard signatures of itinerant ferromagnetism in metals. This surprising result suggests that the overdoped cuprates are strongly influenced by electron correlations.

Publication types

Research Support, Non-U.S. Gov't

Associated data

Dryad/10.5061/dryad.05qfttf08