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


We 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.
Author Fabian von Rohr
Fabian von Rohr,,
, Anna Krztoń-Maziopa (FC / CICSST)
Anna Krztoń-Maziopa,,
- Chair Of Inorganic Chemistry And Solid State Technology
, Henrik Grundmann - [University of Zurich (UZH)]
Henrik Grundmann,,
- Universität Zürich
, Zurab Guguchia - [University of Zurich]
Zurab Guguchia,,
, Wolfgang Schnick - [Ludwig-Maximilians-Universität München]
Wolfgang Schnick,,
, Andreas Schilling - [University of Zurich]
Andreas Schilling,,
Journal seriesJournal of Physics-Condensed Matter, ISSN 0953-8984, [1361-648X]
Issue year2016
Publication size in sheets0.3
Keywords in English magnetic structure determination, ThCr2Si2 structure, iron-based superconductors, metamagnetism
ASJC Classification3104 Condensed Matter Physics; 2500 General Materials Science
Languageen angielski
wdpb_publikacje_pliki_plik_publikacja_2867_org.pdf 1.44 MB
Score (nominal)30
Score sourcejournalList
ScoreMinisterial score = 30.0, 17-07-2020, ArticleFromJournal
Ministerial score (2013-2016) = 30.0, 17-07-2020, ArticleFromJournal
Publication indicators Scopus Citations = 4; Scopus SNIP (Source Normalised Impact per Paper): 2016 = 0.938; WoS Impact Factor: 2016 = 2.649 (2) - 2016=2.305 (5)
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