New Magnetic Excitations in the Spin-Density-Wave of Chromium

TL;DR

This paper reports the discovery of a new magnetic excitation in chromium's spin-density-wave phase, characterized by a weakly dispersing mode with an energy gap, using neutron scattering techniques.

Contribution

It reveals a previously unobserved magnetic excitation in chromium, expanding understanding of its low-energy magnetic dynamics.

Findings

Identified a new magnetic excitation around (0,0,1)

The excitation has an energy gap of approximately 4 meV

The mode corresponds to the Fincher mode along the incommensurate wavevector

Abstract

Low-energy magnetic excitations of chromium have been reinvestigated with a single-Q crystal using neutron scattering technique. In the transverse spin-density-wave phase a new type of well-defined magnetic excitation is found around (0,0,1) with a weak dispersion perpendicular to the wavevector of the incommensurate structure. The magnetic excitation has an energy gap of E ~ 4 meV and at (0,0,1) exactly corresponds to the Fincher mode previously studied only along the incommensurate wavevector.