Magnetoelastic coupling in the stretched diamond lattice of TbTaO4†

IF 5.2 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Advances Pub Date : 2025-03-10 DOI:10.1039/D4MA01156B

Xiaotian Zhang, Nicola D. Kelly, Denis Sheptyakov, Cheng Liu, Shiyu Deng, Siddharth S. Saxena and Siân E. Dutton

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Abstract

The magnetic structure of diamond-like lattice has been studied extensively in terms of the magnetic frustration. Here we report the distortion of stretched diamond lattice of Tb³⁺ (4f⁸) in M–TbTaO₄ on application of a magnetic field. We have investigated the structural and magnetic properties of M phase terbium tantalate M–TbTaO₄ as a function of temperature and magnetic field using magnetometry and powder neutron diffraction. Sharp λ-shape transitions in d(χT)/dT, dM/dH and specific heat data confirm the previously reported three-dimensional (3D) antiferromagnetic ordering at T_N ∼ 2.25 K. On application of a magnetic field the Néel temperature is found to decrease and variable field neutron diffraction experiments below T_N at 1.6 K show an increase in both the bond and angle distortion of the stretched diamond lattice with magnetic field, indicating a potential magneto-elastic coupling effect. By combining our magnetometry, heat capacity and neutron diffraction results we generate a magnetic phase diagram for M–TbTaO₄ as a function of temperature and field.

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TbTaO4†拉伸金刚石晶格中的磁弹性耦合

类金刚石晶格的磁性结构已经从磁挫折的角度得到了广泛的研究。本文报道了M-TbTaO4中Tb3+ (4f8)拉伸金刚石晶格在磁场作用下的畸变。利用磁强计和粉末中子衍射研究了M相钽酸铽M - tbtao4的结构和磁性能与温度和磁场的关系。d(χT)/dT， dM/dH和比热数据的急剧λ形状转变证实了之前报道的TN ~ 2.25 K的三维（3D）反铁磁有序。在外加磁场的作用下，金刚石晶格的温度降低，在1.6 K下的变场中子衍射实验表明，在磁场作用下，拉伸后的金刚石晶格的键畸变和角度畸变都有所增加，表明存在潜在的磁弹性耦合效应。结合磁强计、热容和中子衍射结果，我们得到了M-TbTaO4随温度和场的磁相图。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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