The decisive role of magnetic anisotropy in honeycomb layered Li3Ni2SbO6 and Na3Ni2SbO6

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:481

Article

Werner, J.¹  Hergett, W.¹  Park, J.¹  Koo, C.¹  Zvereva, E. A.²  Vasiliev, A. N.^2,3,4  Klingeler, R.^1,5 

[1] Heidelberg Univ, Kirchhoff Inst Phys, INF 227, D-69120 Heidelberg, Germany

[2] Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119991, Russia

[3] Natl Univ Sci & Technol MISiS, Moscow 119049, Russia

[4] South Ural State Univ, Russia Natl Res, Chelyabinsk 454080, Russia

[5] Heidelberg Univ, Ctr Adv Mat, INF 225, D-69120 Heidelberg, Germany

关键词: Honeycomb layers;    Magnetisation;    Magnetism;    Anisotropy;    Phase diagram;    Electron spin resonance;   

DOI  :  10.1016/j.jmmm.2019.02.054

来源: Elsevier

【 摘 要 】

The decisive role of magnetic anisotropy even in systems with small anisotropy is illustrated for the honeycomb-layered antiferromagnets A(3)Ni(2)SbO(6) with A = Li and Na. Both systems evolve long range magnetic order below T-N = 14 and 16.5 K, respectively. The magnetic phase diagrams obtained from static magnetisation studies up to 15 T imply competing antiferromagnetic phases and a tricritical point at T-N. The phase boundaries are visible in the dynamic response of the antiferromagnetic resonance modes, too, which investigation by means of high frequency/high field electron spin resonance enables precise determination of magnetic anisotropy. The anisotropy gap amounts to Delta = 360 +/- 2 GHz in Na3Ni2SbO6 while in Li3Ni2SbO6 orthorhombicity is associated with Delta = 198 +/- 4 and 218 +/- 4 GHz. Above T-N, the data imply short-range antiferromagnetic order up to at least 80 K. The data suggest a crucial role of anisotropy for selecting the actual spin structure at B = 0 T.

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