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Title:Comparing magnetism in isostructural oxides A[sub](0.8)La[sub](1.2)MnO[sub](4.1) : anisotropic spin glass (A = Ba) versus long range order (A = Sr)
Authors:ID Dragomir, Mirela, IJS (Author)
ID Dube, Paul A. (Author)
ID Arčon, Iztok, UNG (Author)
ID Boyer, Chad (Author)
ID Rutherford, Meghan (Author)
ID Wiebe, Christopher (Author)
ID King, Graham (Author)
ID Dabkowska, Hanna (Author)
ID Greedan, John E. (Author)
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Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:This study presents the strikingly distinct magnetic properties of two isostructural compounds, Ba0.8La1.2MnO4.1 and Sr0.8La1.2MnO4.1 (K2NiF4 type, I4/mmm). Spectroscopic studies have shown that Mn is in a +3.0(1) oxidation state only, in both compounds; therefore, the charge is balanced by accommodating extra oxygen at interstitial sites, as confirmed by neutron powder diffraction. We found that the Ba compound exhibits an exceedingly rare anisotropic spin glass behavior, Tg = 26.4(4) K, with the moment freezing along the c-axis only while the in-plane spin components remain dynamic well below Tg. Experimental results including neutron diffraction, heat capacity, and magnetic (dc and ac) measurements performed on an oriented single crystal support this conclusion. This is a remarkable result, the only other known example of an anisotropic spin glass being Fe2TiO5. The spin glass state in Ba0.8La1.2MnO4.1 is argued to arise due to competing antiferromagnetic and ferromagnetic 180° Mn3+−O−Mn3+ superexchange interactions. In contrast, the Sr analogue shows 2D antiferromagnetic correlations and long-range antiferromagnetic order below 95(1) K with a remarkably reduced ordered moment of 1.449(49) μB/Mn3+ instead of the ∼4 μB expected for an S = 2 ion.
Keywords:antiferomagnetiki, Mn XANES, struktura
Publication version:Version of Record
Year of publishing:2019
Number of pages:7833-7844
PID:20.500.12556/RUNG-4814-d5964a61-ec7b-b532-46e3-ab7b44668f01 New window
COBISS.SI-ID:32603431 New window
ISSN on article:0897-4756
DOI:10.1021/acs.chemmater.9b01466 New window
Publication date in RUNG:23.10.2019
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Record is a part of a journal

Title:Chemistry of materials
Shortened title:Chem. mater.
Publisher:The Society
Year of publishing:13
COBISS.SI-ID:6557189 New window