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Ferromagnetism versus slow paramagnetic relaxation in Fe-doped Li3N

TitleFerromagnetism versus slow paramagnetic relaxation in Fe-doped Li3N
Publication TypeJournal Article
Year of Publication2018
AuthorsFix, M, Jesche, A, Jantz, SG, Brauninger, SA, Klauss, HH, Manna, RS, Pietsch, IM, Hoppe, HA, Canfield, PC
JournalPhysical Review B
Volume97
Pagination064419
Date Published02
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000426015100003
Keywordscluster, crystals, growth, heat-capacity, lithium nitride, magnetization, physics, single-molecule magnets
Abstract

10 K, however, the relaxation times of tau approximate to 10(10) s are only weakly temperature-dependent, indicating the relevance of a quantum tunneling process instead of thermal excitations. The magnetic entropy amounts to more than 25 J mol(Fe)(-1)K(-1), which significantly exceeds R ln2, the value expected for the entropy of a ground-state doublet. Thermal expansion and magnetostriction indicate a weak magnetoelastic coupling in accordance with slow relaxation of the magnetization. The classification of Li-2(Li1-xFex)N as ferromagnet is stressed and contrasted with highly anisotropic and slowly relaxing paramagnetic behavior.

DOI10.1103/PhysRevB.97.064419
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Complex States