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Field-induced transition of the magnetic ground state from A-type antiferromagnetic to ferromagnetic order in $CsCo_2Se_2$


von Rohr, Fabian; Krzton-Maziopa, Anna; Pomjakushin, Vladimir; Grundmann, Henrik; Guguchia, Zurab; Schnick, Wolfgang; Schilling, Andreas (2016). Field-induced transition of the magnetic ground state from A-type antiferromagnetic to ferromagnetic order in $CsCo_2Se_2$. Journal of Physics: Condensed Matter, 28(27):276001.

Abstract

We report on the magnetic properties of $CsCo_2Se_2$ with $ThCr_2Si_2$ structure, which we have characterized through a series of magnetization and neutron diffraction measurements. We find that $CsCo_2Se_2$ undergoes a phase transition to an antiferromagnetically ordered state with a Néel temperature of $T_N ≈ 66 K$. The nearest neighbour interactions are ferromagnetic as observed by the positive Curie-Weiss temperature of $\Theta ≈ 51.0 K$. We find that the magnetic structure of $CsCo_2Se_2$ consists of ferromagnetic sheets, which are stacked antiferromagnetically along the tetragonal 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)$μ_{Bohr}$  / Co. Already in comparably small magnetic fields of $μ_0H _{MM}(5~K) ≈ 0.3 T$, we observe a metamagnetic transition that can be attributed to spin-rearrangements of $CsCo_2Se_2$, with the moments fully ferromagnetically saturated in a magnetic field of $μ_0 H_{FM}(5~K) ≈ 6.4 T$. We discuss the entire experimentally deduced magnetic phase diagram for $CsCo_2Se_2$ with respect to its unconventionally weak magnetic coupling. Our study characterizes $CsCo_2Se_2$, which is chemically and electronically posed closely to the $A_xFe_{2-y}Se_2$ superconductors, as a host of versatile magnetic interactions.

Abstract

We report on the magnetic properties of $CsCo_2Se_2$ with $ThCr_2Si_2$ structure, which we have characterized through a series of magnetization and neutron diffraction measurements. We find that $CsCo_2Se_2$ undergoes a phase transition to an antiferromagnetically ordered state with a Néel temperature of $T_N ≈ 66 K$. The nearest neighbour interactions are ferromagnetic as observed by the positive Curie-Weiss temperature of $\Theta ≈ 51.0 K$. We find that the magnetic structure of $CsCo_2Se_2$ consists of ferromagnetic sheets, which are stacked antiferromagnetically along the tetragonal 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)$μ_{Bohr}$  / Co. Already in comparably small magnetic fields of $μ_0H _{MM}(5~K) ≈ 0.3 T$, we observe a metamagnetic transition that can be attributed to spin-rearrangements of $CsCo_2Se_2$, with the moments fully ferromagnetically saturated in a magnetic field of $μ_0 H_{FM}(5~K) ≈ 6.4 T$. We discuss the entire experimentally deduced magnetic phase diagram for $CsCo_2Se_2$ with respect to its unconventionally weak magnetic coupling. Our study characterizes $CsCo_2Se_2$, which is chemically and electronically posed closely to the $A_xFe_{2-y}Se_2$ superconductors, as a host of versatile magnetic interactions.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2016
Deposited On:11 Jan 2017 17:44
Last Modified:21 Nov 2017 18:50
Publisher:IOP Publishing
ISSN:0953-8984
Additional Information:This is an author-created, un-copyedited version of an article accepted for publication in Journal of Physics: Condensed Matter. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at 10.1088/0953-8984/28/27/276001
Publisher DOI:https://doi.org/10.1088/0953-8984/28/27/276001
PubMed ID:27195766

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