Ferromagnetism versus slow paramagnetic relaxation in Fe-doped Li3N

dc.contributor.author Fix, M.
dc.contributor.author Jesche, A.
dc.contributor.author Jantz, S. G.
dc.contributor.author Bräuninger, S. A.
dc.contributor.author Klauss, H.-H.
dc.contributor.author Manna, R. S.
dc.contributor.author Pietsch, I. M.
dc.contributor.author Höppe, H. A.
dc.contributor.author Canfield, Paul
dc.contributor.department Ames Laboratory
dc.contributor.department Physics and Astronomy
dc.date 2019-12-12T20:36:54.000
dc.date.accessioned 2020-06-29T23:23:38Z
dc.date.available 2020-06-29T23:23:38Z
dc.date.issued 2018-02-01
dc.description.abstract <p>We report on isothermal magnetization, Mossbauer spectroscopy, and magnetostriction as well as temperature-dependent alternating-current (ac) susceptibility, specific heat, and thermal expansion of single crystalline and polycrystalline Li-2(Li1-xFex)N with x = 0 and x approximate to 0.30. Magnetic hysteresis emerges at temperatures below T approximate to 50 K with coercivity fields of up to mu H-0 = 11.6 T at T = 2 K and magnetic anisotropy energies of 310 K (27 meV). The ac susceptibility is strongly frequency-dependent (f = 10-10 000 Hz) and reveals an effective energy barrier for spin reversal of Delta E approximate to 1100 K (90 meV). The relaxation times follow Arrhenius behavior for T > 25 K. ForT < 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.</p>
dc.identifier archive/lib.dr.iastate.edu/ameslab_manuscripts/511/
dc.identifier.articleid 1514
dc.identifier.contextkey 15980132
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ameslab_manuscripts/511
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/7440
dc.language.iso en
dc.relation.ispartofseries IS-J 9591
dc.source.uri https://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=1525&context=physastro_pubs
dc.subject.disciplines Condensed Matter Physics
dc.title Ferromagnetism versus slow paramagnetic relaxation in Fe-doped Li3N
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isOrgUnitOfPublication 25913818-6714-4be5-89a6-f70c8facdf7e
relation.isOrgUnitOfPublication 4a05cd4d-8749-4cff-96b1-32eca381d930