Magnetic Properties and Specific Heat of Quasi-Two-Dimensional Triangular Lattice Antiferromagnet Ba3CoNb2O9 Single Crystals

IF 3.3 3区 化学 Q2 CHEMISTRY, PHYSICAL
Han-Shu Xu, Yuhu Huang, Jin Li, Fei Zheng
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Abstract

We successfully synthesized high-quality Ba3CoNb2O9 single crystals on the millimeter scale using the flux method, which had not been reported in previous studies. As the temperature decreases, the system undergoes two corresponding antiferromagnetic phase transitions with different magnetic structures at TN1 = 0.90 K and TN2 = 0.55 K. At 0.4 K, as the magnetic field applied to the ab plane gradually increases, the magnetization value gradually increases without exhibiting a 1/3 magnetization plateau, indicating that the spin direction of Co2+ (S = 1/2) in the ground state tends to align along the c-axis rather than forming a 120° arrangement within the ab plane. In addition, the specific heat results of the Ba3CoNb2O9 single crystal confirm that even below TN2, the system still has strong frustration.

Abstract Image

准二维三角形晶格反铁磁体Ba3CoNb2O9单晶的磁性能和比热
我们利用通量法成功合成了高质量的毫米级Ba3CoNb2O9单晶,这在以往的研究中是没有报道过的。随着温度的降低,在TN1 = 0.90 K和TN2 = 0.55 K处,体系发生了两次具有不同磁性结构的反铁磁相变。在0.4 K时,随着施加在ab平面上的磁场逐渐增大,磁化值逐渐增大,但没有出现1/3的磁化平台,说明Co2+ (S = 1/2)在基态的自旋方向倾向于沿c轴排列,而不是在ab平面内形成120°排列。此外,Ba3CoNb2O9单晶比热结果证实,即使在TN2以下,该体系仍具有很强的挫败感。
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来源期刊
The Journal of Physical Chemistry C
The Journal of Physical Chemistry C 化学-材料科学:综合
CiteScore
6.50
自引率
8.10%
发文量
2047
审稿时长
1.8 months
期刊介绍: The Journal of Physical Chemistry A/B/C is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, and chemical physicists.
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