▶  高精度光学浮区炉助力单晶样品在磁电领域取得重要进展

近期，哈尔滨工业大学的W.Q.Liu等人对磁电材料Mn₄Nb₂O₉单晶样品进行了仔细的研究。研究表明：零磁场测试介电常数时，没有发现介电常数的反常，此时Mn₄Nb₂O₉基态表现为顺电特性；而在磁场条件下，介电常数在Neel温度处发生突变的峰，且随着磁场的增加介电峰也增强，且峰位向低温端偏移，这意味着磁场有抑制反铁磁转变的趋势；高场（H≥4T）下的介电常数-温度依赖关系也跟H²正比关系，由此也表明Mn₄Nb₂O₉是线性磁电材料。更多研究结果可参考文献^[4].

以上图片引自文献^[4].

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Fig. 2. Photographs of (a) a wafer with a growth rate of 5 mm/h in pure oxygen. (b) An as-grown (Nb + ln) co-doped TiO2 crystal with growth rate of 5 mm/h in air and the crystal wafer cut perpendicular to the growth direction.

参考文献：

“High quality(InNb)0.1Ti0.9O2 single crystal grown using optical floating zone method“. Journal of Crystal Growth 446(2016)74–78.

1. Evidence of linear magnetoelectric effect in Mn₄Nb₂O₉ single crystal, Journal of Alloys and Compounds, Volume 886,2021,161272,ISSN 0925-8388.

2. Enhanced stability of floating-zone by modifying its liquid wetting ability and fluidity for YBa₂Cu₃O_7-δ crystal growth, Ceramics International，Volume 47, Issue 4, 15 February 2021, Pages 5495-5501.

3. Ultralow-temperature heat transport in the quantum spin liquid candidate Ca₁₀Cr₇O₂₈ with a bilayer kagome lattice, PHYSICAL REVIEW B 97, 104413 (2018).

4. 光学浮区法生长掺铟氧化镓单晶及其性能, 硅酸盐学报 Vol. 45，No. 4，April，2017，P548-P552.

5. High quality(InNb)0.1Ti0.9O2 single crystal grown using optical floating zone method, Journal of Crystal Growth 446(2016)74–78.

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高精度光学浮区法单晶炉

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