Browsing by Author "Li, RB"

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    Tuning the magnetic anisotropy via Mn substitution in single crystal Co4Nb2O9
    (Elsevier, 2019-01-01) Yu, YS; Deng, GC; Cao, YM; McIntyre, GJ; Li, RB; Yuan, N; Feng, ZJ; Ge, JY; Zhang, JC; Cao, SX
    By using the optical floating-zone technique to grow a series of high-quality Co4-xMnxNb2O9 single crystals, the effect of Mn doping on the magnetic anisotropy and spin-flop is investigated. The antiferromagnetic phase transition and spin-flop transition for these samples (x ≤ 3.9) are similar to those in the parent phase of Co4Nb2O9, revealing that Co2+ ions in Co4-xMnxNb2O9 possess a strong single-ion anisotropy. The critical doping content, above which the magnetic anisotropy changes from easy-plane to easy-axis, has been identified as x = 3.95 with an additional kink observed in the magnetization curve below the N é el temperature. A spin-flop transition is reported for the first time in Mn4Nb2O9 at a field of 10.9 T at 2 K. © 2018 Elsevier Ltd and Techna Group S.r.l.