Repozitorij Univerze v Novi Gorici

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Naslov: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)
Avtorji:Dragomir, Mirela (Avtor)
Dube, Paul A. (Avtor)
Arčon, Iztok (Avtor)
Boyer, Chad (Avtor)
Rutherford, Meghan (Avtor)
Wiebe, Christopher (Avtor)
King, Graham (Avtor)
Dabkowska, Hanna (Avtor)
Greedan, John E. (Avtor)
Datoteke:Gradivo nima datotek. Gradivo je morda fizično dosegljivo v knjižnici fakultete, zalogo lahko preverite v COBISS-u. Povezava se odpre v novem oknu
Jezik:Angleški jezik
Vrsta gradiva:Delo ni kategorizirano (r6)
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:UNG - Univerza v Novi Gorici
Opis: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.
Ključne besede:antiferomagnetiki, Mn XANES, struktura
Leto izida:2019
Št. strani:7833-7844
Številčenje:31
COBISS_ID:32603431 Povezava se odpre v novem oknu
ISSN pri članku:0897-4756
URN:URN:SI:UNG:REP:PUK7SON9
DOI:10.1021/acs.chemmater.9b01466 Povezava se odpre v novem oknu
Število ogledov:1421
Število prenosov:0
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
Področja:Gradivo ni uvrščeno v področja.
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Skupna ocena:(0 glasov)
Vaša ocena:Ocenjevanje je dovoljeno samo prijavljenim uporabnikom.

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Gradivo je del revije

Naslov:Chemistry of materials
Skrajšan naslov:Chem. mater.
Založnik:The Society
ISSN:0897-4756
COBISS.SI-ID:6557189 Novo okno
Leto izida:13

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