Field-induced transition of the magnetic ground state from A-type antiferromagnetic to ferromagnetic order in CsCo2Se2

Abstract

We report on the magnetic properties of CsCo${}_2$Se${}_2$ with ThCr${}_2$Si${}_2$ structure, which we have characterized through a series of magnetization and neutron diffraction measurements. We find that CsCo${}_2$Se2${}_2$ undergoes a phase transition to an antiferromagnetically ordered state with a Néel temperature of $T_{\mathrm{N}}\approx$ 66 K. The nearest neighbour interactions are ferromagnetic as observed by the positive Curie-Weiss temperature of $\Theta \approx$ 51.0 K. We find that the magnetic structure of CsCo${}_2$Se${}_2$ consists of ferromagnetic sheets, which are stacked antiferromagnetically along the tetragonal \textit{c}-axis, generally referred to as A-type antiferromagnetic order. The observed magnitude of the ordered magnetic moment at $T$ = 1.5 K is found to be only 0.20(1)${\mu }_{\mathrm{Bohr}}$/Co. Already in comparably small magnetic fields of ${\mu }_0{H}_{MM}$(5K) $\approx$ 0.3 T, we observe a metamagnetic transition that can be attributed to spin-rearrangements of CsCo${}_2$Se${}_2$, with the moments fully ferromagnetically saturated in a magnetic field of ${\mu }_0{H}_{\mathrm{FM}}$(5K) $\approx$ 6.4 T. We discuss the entire experimentally deduced magnetic phase diagram for CsCo${}_2$Se${}_2$ with respect to its unconventionally weak magnetic coupling. Our study characterizes CsCo${}_2$Se${}_2$, which is chemically and electronically posed closely to the $A_{x}F{e}_{2-y}S{e}_2$ superconductors, as a host of versatile magnetic interactions.

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