Exploring metamagnetism of single crystalline \eun\ by neutron scattering

TL;DR

This study uses neutron diffraction to investigate the magnetic structures and metamagnetic behavior of single crystalline eun, revealing complex magnetic phases and field-dependent transitions in this intermetallic compound.

Contribution

It provides detailed neutron scattering data on the magnetic phases of eun, including the identification of a spiral magnetic structure and field-induced transitions.

Findings

Low temperature phase has a spiral magnetic structure with wave-vector (1/4, , 0)

Magnetic field along c-axis correlates with magnetization behavior

Two magnetic transitions observed when field is along the b-axis

Abstract

We present here a neutron diffraction study, both in zero field and as a function of magnetic field, of the magnetic structure of the tetragonal intermetallic \eun\ on a single crystalline sample. This material is known to undergo a cascade of transitions, first at 13.2\,K towards an incommensurate modulated magnetic structure, then at 10.5\,K to an equal moment, yet undetermined, antiferromagnetic structure. We show here that the low temperature phase presents a spiral moment arrangement with wave-vector {\bf k} = ($\frac{1}{4},\delta,0)$. For a magnetic field applied along the tetragonal {\bf c}-axis, the square root of the scattering intensity of a chosen reflection matches very well the complex metamagnetic behavior of the magnetization along {\bf c} measured previously. For the magnetic field applied along the {\bf b}-axis, two magnetic transitions are observed below the transition to a fully polarized state.