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Magnetism of frustrated A-site spinels (Mn, Fe, Co)Al2O4
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och materialvetenskap.
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2009 (engelsk)Inngår i: Physica. B, Condensed matter, ISSN 0921-4526, E-ISSN 1873-2135, Vol. 404, nr 5-7, s. 660-662Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In the A-site spinels MAl2O4 (M = Mn, Fe, Co) the A-site sublattice is subjected to strong frustration, putting all three compounds on the verge between long-range and short-range magnetic order. The mu SR spectra of the three compounds show two signals at all temperatures examined and a dramatic change in spectral shape at characteristic temperatures. Above this temperature, one signal (slowly relaxing) is typical for free paramagnetic spins, the other (fast relaxing) for highly correlated paramagnetic spins. For M = Mn the ratio of their intensities is 1:3 independent of temperature and the spectral change occurs around 40 K (T-N from neutron data) where the strongly correlated fraction enters into long-range order and the free paramagnetic fraction into a glassy spin state. For M = Co or Fe, the free paramagnetic fraction increases from similar to 20% to 85% with rising temperature. At the cusp temperatures observed in magnetization (5 or 12 K) the dominating, highly correlated paramagnetic fraction turns into a dynamic short-range ordered magnetic ground state. In all three compounds substantial local spin disorder and persistent spin fluctuations characterize their magnetic ground states, typical features of highly frustrated magnets.

sted, utgiver, år, opplag, sider
2009. Vol. 404, nr 5-7, s. 660-662
Emneord [en]
Magnetic frustration, Spinels, Muon spin rotation
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-148881DOI: 10.1016/j.physb.2008.11.103ISI: 000265469800024OAI: oai:DiVA.org:uu-148881DiVA, id: diva2:403461
Tilgjengelig fra: 2011-03-14 Laget: 2011-03-11 Sist oppdatert: 2017-12-11bibliografisk kontrollert

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