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Proposed Bose-Einst...
Proposed Bose-Einstein condensation of magnons in nanostructured films of Gd at low temperature and its manifestations in electrical resistivity and magnetoresistance
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- Chakravorty, Manotosh (författare)
- SN Bose Natl Ctr Basic Sci, Dept Condensed Matter Phys & Mat Sci, Block JD,Sect 3, Kolkata 700098, W Bengal, India.
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- Raychaudhuri, A. K. (författare)
- SN Bose Natl Ctr Basic Sci, Dept Condensed Matter Phys & Mat Sci, Block JD,Sect 3, Kolkata 700098, W Bengal, India.
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- Sarkar, Tapati (författare)
- Uppsala universitet,Fasta tillståndets fysik
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- Andersson, Mikael Svante (författare)
- Uppsala universitet,Fasta tillståndets fysik
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SN Bose Natl Ctr Basic Sci, Dept Condensed Matter Phys & Mat Sci, Block JD,Sect 3, Kolkata 700098, W Bengal, India Fasta tillståndets fysik (creator_code:org_t)
- 2017
- 2017
- Engelska.
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Ingår i: Journal of Physics. - 0953-8984 .- 1361-648X. ; 29:25
- 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
- In this paper we report the observation of a proposed Bose-Einstein condensation (BEC) of magnons in a temperature range of around 15-20 K in nanostructured films of Gd with grain sizes that are much larger than the size range where superparamagentism is expected. The observation was carried out using magnetic as well as high precision resistivity and magnetoresistance (MR) measurements performed to low temperatures. We observe that the experimental observations depend crucially on one parameter, namely softening of the spin wave stiffness parameter D at BEC and the resistivity as well as MR can be related quantitatively to magnetic measurements through the temperature variation of the constant D in the vicinity of the transition. This paper establishes that the BEC reported before in nanocrystalline Gd can be extended to a somewhat larger size range.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- Bose-Einstein condensation
- magnon
- spin wave stiffness constant
- gadolinium
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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