Successive Short- and Long-Range Magnetic Ordering in Ba2Mn3(SeO3)6 with Honeycomb Layers of Mn3+ Ions Alternating with Triangular Layers of Mn2+ Ions

Author:

Moskin Artem12,Kozlyakova Ekaterina12,Chung Seung Hwan3,Koo Hyun-Joo3,Whangbo Myung-Hwan34ORCID,Vasiliev Alexander12

Affiliation:

1. Department of Low Temperature Physics and Superconductivity, Lomonosov Moscow State University, Moscow 119991, Russia

2. Functional Quantum Materials Laboratory, National University of Science and Technology “MISIS”, Moscow 119049, Russia

3. Department of Chemistry and Research Institute for Basic Sciences, Kyung Hee University, Seoul 02447, Republic of Korea

4. Department of Chemistry, North Carolina State University, Raleigh, NC 27695-8204, USA

Abstract

Mixed-valent Ba2Mn2+Mn23+(SeO3)6 crystallizes in a monoclinic P21/c structure and has honeycomb layers of Mn3+ ions alternating with triangular layers of Mn2+ ions. We established the key parameters governing its magnetic structure by magnetization M and specific heat Cp measurements. The title compound exhibits a close succession of a short-range correlation order at Tcorr = 10.1 ± 0.1 K and a long-range Néel order at TN = 5.7 ± 0.1 K, and exhibits a metamagnetic phase transition at T < TN with hysteresis most pronounced at low temperatures. The causes for these observations were found using the spin exchange parameters evaluated by density functional theory calculations. The title compound represents a unique case in which uniform chains of integer spin Mn3+ (S = 2) ions interact with those of half-integer spin Mn2+ (S = 5/2) ions.

Funder

Russian Government

National Research Foundation of Korea

Ministry of Education

Publisher

MDPI AG

Subject

General Materials Science

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