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Low temperature inc...
Low temperature incommensurately modulated and noncollinear spin structure in FeCr2S4
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Kalvius, G. M. (författare)
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Krimmel, A. (författare)
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- Hartmann, Ola (författare)
- Uppsala universitet,Institutionen för fysik och materialvetenskap
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- Wäppling, Roger (författare)
- Uppsala universitet,Institutionen för fysik och materialvetenskap
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Wagner, F. E. (författare)
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Litterst, F. J. (författare)
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Tsurkan, V. (författare)
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Loidl, A. (författare)
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(creator_code:org_t)
- 2010-01-19
- 2010
- Engelska.
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Ingår i: Journal of Physics. - : IOP Publishing. - 0953-8984 .- 1361-648X. ; 22:5, s. 052205-
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- FeCr2S4 orders magnetically at T-N approximate to 170 K. According to neutron diffraction, the ordered state down to 4.2 K is a simple collinear ferrimagnet maintaining the cubic spinel structure. Later studies, however, claimed trigonal distortions below similar to 60 K coupled to the formation of a spin glass type ground state. To obtain further insight, muon spin rotation/relaxation (mu SR) spectroscopy was carried out between 5 and 200 K together with new Fe-57 Mossbauer measurements. Below similar to 50 K, our data point to the formation of an incommensurately modulated noncollinear spin arrangement like a helical spin structure. Above 50 K, the spectra are compatible with collinear ferrimagnetism, albeit with a substantial spin disorder on the scale of a few lattice constants. These spin lattice distortions become very large at 150 K and the magnetic state is now better characterized as consisting of rapidly fluctuating short-range ordered spins. The Neel transition is of second order, but ill defined, extending over a range of similar to 10 K. The Mossbauer data around 10 K confirm the onset of orbital freezing and are also compatible with the noncollinear order of iron. The absence of a major change in the quadrupole interaction around 50 K renders the distortion of crystal symmetry to be small.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- Physics
- Fysik
- TECHNOLOGY
- TEKNIKVETENSKAP
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