Ferromagnetism versus slow paramagnetic relaxation in Fe-doped Li3N

Fix, M.; Jesche, A.; Jantz, S. G.; Bräuninger, S. A.; Klauss, H. -H.; Manna, R. S.; Pietsch, I. M.; Höppe, H. A.; Canfield, P. C.

doi:10.1103/PhysRevB.97.064419

Title: Ferromagnetism versus slow paramagnetic relaxation in Fe-doped ${Li}_{3} N$

Journal Article · 23 February 2018 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.97.064419 · OSTI ID:1425481

Fix, M. ^[1]; Jesche, A. ^[2]; Jantz, S. G. ^[3]; Bräuninger, S. A. ^[4]; Klauss, H. -H. ^[4]; Manna, R. S. ^[5]; Pietsch, I. M. ^[1]; Höppe, H. A. ^[3]; Canfield, P. C. ^[6]

Univ. of Augsburg (Germany). EP VI, Center for Electronic Correlations and Magnetism, Inst. of Physics
Univ. of Augsburg (Germany). EP VI, Center for Electronic Correlations and Magnetism, Inst. of Physics; Ames Lab. and Iowa State Univ., Ames, IA (United States)
Univ. of Augsburg (Germany). Chair of Solid State Chemistry, Inst. of Physics
Technische Universitat Dresden, Dresden (Germany). Inst. for Solid State and Materials Physics
Univ. of Augsburg (Germany). EP VI, Center for Electronic Correlations and Magnetism, Inst. of Physics; IIT Tirupati, Tirupati (India). Dept. of Physics
Ames Lab. and Iowa State Univ., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy

We report on isothermal magnetization, Mössbauer spectroscopy, and magnetostriction as well as temperature-dependent alternating-current (ac) susceptibility, specific heat, and thermal expansion of single crystalline and polycrystalline Li₂ ( Li_1-xFe_x) N with x = 0 and x ≈ 0.30 . Magnetic hysteresis emerges at temperatures below T ≈ 50 K with coercivity fields of up to μ₀H = 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 Δ E ≈ 1100 K (90 meV). The relaxation times follow Arrhenius behavior for T > 25 K . For T < 10 K , however, the relaxation times of τ ≈ 10¹⁰s 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^-1_Fe K^-1, which significantly exceeds R ln 2 , 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 Li₂ ( Li_1-xFe _x) N as ferromagnet is stressed and contrasted with highly anisotropic and slowly relaxing paramagnetic behavior.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: German Research Foundation (DFG); USDOE

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1425481

Report Number(s):: IS-J--9591

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 6 Vol. 97; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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