Fermi Surface reconstruction and anomalous low temperature resistivity in electron-doped La2-xCexCuO4

TL;DR

This study investigates Fermi surface reconstruction and unusual low-temperature resistivity in electron-doped La2-xCexCuO4, revealing a critical doping point associated with antiferromagnetic order and pseudogap phenomena.

Contribution

It provides experimental evidence of Fermi surface reconstruction at a specific doping level and links it to magnetic phases and resistivity anomalies in electron-doped cuprates.

Findings

Fermi surface reconstructs at Ce=0.14

Low temperature linear-in-T resistivity observed at Ce=0.14 and higher doping

Hall coefficient changes dramatically near Ce=0.14

Abstract

We report ab-plane Hall Effect and magnetoresistivity measurements on La2-xCexCuO4 thin films as a function of doping for magnetic fields up to 14T and temperatures down to 1.8K. A dramatic change in the low temperature (1.8 K) normal state Hall coefficient is found near a doping Ce=0.14. This, along with a nonlinear Hall resistance as a function of magnetic field, suggests that the Fermi surface reconstructs at a critical doping of Ce= 0.14. A competing antiferromagnetic phase is the likely cause of this Fermi surface reconstruction. Low temperature linear-in-T resistivity is found at Ce=0.14, but anomalously, also at higher doping. We compare our data with similar behavior found in hole-doped cuprates at a doping where the pseudogap ends