Magnetic field effect on the superconducting magnetic gap of Nd{1.85}Ce{0.15}CuO4

TL;DR

This study investigates how high magnetic fields influence the superconducting magnetic gap in Nd{1.85}Ce{0.15}CuO4, revealing a linear field effect and no in-gap states, aligning with the normal state behavior at high fields.

Contribution

It provides the first detailed high-field neutron scattering data on electron-doped cuprates, showing a linear magnetic field dependence of the superconducting gap without in-gap states.

Findings

Superconducting gap decreases linearly with magnetic field.

No field-induced in-gap states observed.

Gap closes near the upper critical field Hc2.

Abstract

Inelastic neutron scattering measurements on the archetypical electron-doped material Nd{1.85}Ce{0.15}CuO4 up to high relative magnetic field strength, H/Hc2 ~ 50%, reveal a simple linear magnetic-field effect on the superconducting magnetic gap and the absence of field-induced in-gap states. The extrapolated gap-closing field value is consistent with the upper critical field Hc2, and the high-field response resembles that of the paramagnetic normal state.