Field-induced transition of the magnetic ground state from A-type antiferromagnetic to ferromagnetic order in CsCo2Se2
Fabian von Rohr , Anna Krztoń-Maziopa , Henrik Grundmann , Zurab Guguchia , Wolfgang Schnick , Andreas Schilling
AbstractWe report on the magnetic properties of CsCo2Se2 with ThCr2Si2 structure, which we have characterized through a series of magnetization and neutron diffraction measurements. We find that CsCo2Se2 undergoes a phase transition to an antiferromagnetically ordered state with a Néel temperature of TN�66 K. The nearest neighbour interactions are ferromagnetic as observed by the positive Curie–Weiss temperature of ��51.0 K. We find that the magnetic structure of CsCo2Se2 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)μBohr / Co. Already in comparably small magnetic fields of μ0H MM(5�K)�0.3 T, we observe a metamagnetic transition that can be attributed to spin-rearrangements of CsCo2Se2, with the moments fully ferromagnetically saturated in a magnetic field of μ0HFM(5�K)�6.4 T. We discuss the entire experimentally deduced magnetic phase diagram for CsCo2Se2 with respect to its unconventionally weak magnetic coupling. Our study characterizes CsCo2Se2, which is chemically and electronically posed closely to the AxFe2−ySe2 superconductors, as a host of versatile magnetic interactions.
|Journal series||Journal of Physics-Condensed Matter, ISSN 0953-8984, [1361-648X]|
|Publication size in sheets||0.3|
|Keywords in English||magnetic structure determination, ThCr2Si2 structure, iron-based superconductors, metamagnetism|
|Score|| = 30.0, 31-01-2020, ArticleFromJournal|
= 30.0, 31-01-2020, ArticleFromJournal
|Publication indicators||= 4; : 2016 = 0.938; : 2016 = 2.649 (2) - 2016=2.305 (5)|
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