Unusual Coupling Between Field-induced Spin Fluctuations and Spin Density Wave in Intermetallic CeAg2Ge2

TL;DR

This study reveals an unusual coupling between field-induced spin fluctuations and the spin density wave in CeAg2Ge2, suggesting a new mechanism affecting its magnetic properties at very low temperatures.

Contribution

It provides experimental evidence of a novel coupling mechanism between spin fluctuations and spin density wave in CeAg2Ge2, not previously reported.

Findings

Coupling onset at H=2.7 T and T<3.8 K

Coupling persists down to T~0.05 K

Implications for intrinsic magnetic properties

Abstract

We report on the experimental evidences for an unusual coupling between the magnetic field- induced fluctuations of correlated Ce-ions coinciding with the discontinuous movement of the underlying spin density wave in the intermetallic rare earth compound CeAg2Ge2. The measurements performed using neutron scattering and magnetic Gruneisen ratio methods suggest that the coupling onsets at H= 2.7 T, T < 3.8 K and persists to the lowest measurement temperature T ~ 0.05 K. These measurements suggest a new mechanism behind the spin fluctuations which can affect the intrinsic properties of the system.