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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:Dragomir, Mirela (Author)
Dube, Paul A. (Author)
Arčon, Iztok (Author)
Boyer, Chad (Author)
Rutherford, Meghan (Author)
Wiebe, Christopher (Author)
King, Graham (Author)
Dabkowska, Hanna (Author)
Greedan, John E. (Author)
Files:This document has no files. This document may have a phisical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Language:English
Work type:Not categorized (r6)
Tipology: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
Year of publishing:2019
Number of pages:7833-7844
Numbering:31
COBISS_ID:32603431 Link is opened in a new window
ISSN on article:0897-4756
URN:URN:SI:UNG:REP:PUK7SON9
DOI:10.1021/acs.chemmater.9b01466 Link is opened in a new window
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Title:Chemistry of materials
Shortened title:Chem. mater.
Publisher:The Society
ISSN:0897-4756
COBISS.SI-ID:6557189 New window
Year of publishing:13

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