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On the nature of ma...
On the nature of magnetic state in the spinel Co2SnO4
- Artikel/kapitelEngelska2015
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2015-03-30
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IOP Publishing,2015
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printrdacarrier
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LIBRIS-ID:oai:DiVA.org:uu-253247
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-253247URI
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https://doi.org/10.1088/0953-8984/27/16/166001DOI
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Språk:engelska
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Sammanfattning på:engelska
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In the spinel Co2SnO4, coexistence of ferrimagnetic ordering below T-N similar or equal to 41K followed by a spin glass state below T-SG similar or equal to 39K was proposed recently based on the temperature dependence of magnetization M(T) data. Here new measurements of the temperature dependence of the specific heat C-P(T), ac-susceptibilities chi'(T) and chi ''(T) measured at frequencies between 0.51 and 1.2 kHz, and the hysteresis loop parameters (coercivity H-C(T) and remanence M-R(T)) in two differently prepared samples of Co2SnO4 are reported. The presence of the Co2+ and Sn4+ states is confirmed by x-ray photoelectron spectroscopy (XPS) yielding the structure: Co2SnO4 = [Co2+][Co2+Sn4+]O-4. The data of C-P versus T shows only an inflection near 39K characteristic of spin-glass ordering. The analysis of the frequency dependence of ac-magnetic susceptibility data near 39K using the Vogel-Fulcher law and the power-law of the critical slowing-down suggests the presence of spin clusters in the system which is close to a spin-glass state. With a decrease in temperature below 39K, the temperature dependence of the coercivity H-C and remanence M-R for the zero-field cooled samples show both H-C and M-R reaching their peak magnitudes near 25 K, then decreasing with decreasing T and becoming negligible below 15K. The plot of C-P/T versus T also yields a weak inflection near 15 K. This temperature dependence of HC and remanence MR is likely associated with the different magnitudes of the magnetic moments of Co2+ ions on the 'A' and 'B' sites and their different temperature dependence.
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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Narang, V.
(författare)
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Nayak, S.
(författare)
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Sambasivam, S.
(författare)
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Choi, B. C.
(författare)
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Sarkar, TapatiUppsala universitet,Fasta tillståndets fysik(Swepub:uu)tapsa716
(författare)
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Andersson, Mikael SvanteUppsala universitet,Fasta tillståndets fysik(Swepub:uu)mikan371
(författare)
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Mathieu, RolandUppsala universitet,Fasta tillståndets fysik(Swepub:uu)rma26208
(författare)
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Seehra, M. S.
(författare)
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Uppsala universitetFasta tillståndets fysik
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Journal of Physics: IOP Publishing27:160953-89841361-648X
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