CsCo2(MoO4)2(OH) 的场可调磁跃迁：具有受挫几何形状的三角链结构,Materials Chemistry Frontiers

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CsCo2(MoO4)2(OH) 的场可调磁跃迁：具有受挫几何形状的三角链结构
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2023-02-13 , DOI: 10.1039/d2qm01272c
Liurukara D. Sanjeewa _{1,

2} , V. Ovidiu Garlea ₃ , Randy S. Fishman ₄ , Mahsa Foroughian ₅ , Li Yin ₄ , Jie Xing ₄ , David S. Parker ₄ , Tiffany M. Smith Pellizzeri ₆ , Athena S. Sefat ₄ , Joseph W. Kolis ₅

Affiliation

锯齿链化合物 CsCo ₂ (MoO ₄ ) ₂ (OH) 是一个复杂的磁系统，在这里，我们提供了一系列全面的磁和中子散射测量来确定其磁相图。_{CsCo 2} (MoO ₄ ) ₂ (OH)的磁性表现出与晶格的强耦合，其磁性基态可以很容易地通过施加的磁场来控制。有两个独特的 Co ²⁺离子，base 和 vertex，具有J _bb和J _bv磁交换。磁性是高度各向异性的，b- 轴（链）沿易轴，材料在T _N = 5 K 时反铁磁排列。有两个连续的变磁转变，第一个在H _{c ₁} = 0.2 kOe 进入亚铁磁结构，另一个在H _{c ₂} = 20 kOe 到铁磁相。各个领域的热容量测量支持变磁相变，磁熵值介于S = 3/2 和 1/2 状态之间。零场反铁磁相包含平行于b对齐的顶点磁矢量 (Co(1))轴，而基向量 (Co(2)) 倾斜 34° 并与顶点向量的方向相反。平行相邻链中的自旋沿相反方向排列，形成整体反铁磁结构。在 3 kOe 外加磁场下，相邻链翻转 180° 以生成亚铁磁相。磁场的增加逐渐引起 Co(1) 力矩沿b轴旋转并与 Co(2) 同向排列，从而产生铁磁结构。反铁磁交换参数计算为J _bb = 0.028 meV 和J _bv = 0.13 meV，而链间交换参数在J _ch = (0.0047 / N _ch) 兆伏特。我们的结果表明，CsCo ₂ (MoO ₄ ) ₂ (OH) 是研究与锯齿链磁性相关的新物理的有前途的候选者，它鼓励进一步的理论研究以及具有不同磁性离子的其他锯齿链结构的合成。

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Field tunable magnetic transitions of CsCo2(MoO4)2(OH): a triangular chain structure with a frustrated geometry

The sawtooth chain compound CsCo₂(MoO₄)₂(OH) is a complex magnetic system and here, we present a comprehensive series of magnetic and neutron scattering measurements to determine its magnetic phase diagram. The magnetic properties of CsCo₂(MoO₄)₂(OH) exhibit a strong coupling to the crystal lattice and its magnetic ground state can be easily manipulated by applied magnetic fields. There are two unique Co²⁺ ions, base and vertex, with J_bb and J_bv magnetic exchange. The magnetism is highly anisotropic with the b-axis (chain) along the easy axis and the material orders antiferromagnetically at T_N = 5 K. There are two successive metamagnetic transitions, the first at H_c₁ = 0.2 kOe into a ferrimagnetic structure, and the other at H_c₂ = 20 kOe to a ferromagnetic phase. Heat capacity measurements in various fields support the metamagnetic phase transformations, and the magnetic entropy value is intermediate between S = 3/2 and 1/2 states. The zero field antiferromagnetic phase contains vertex magnetic vectors (Co(1)) aligned parallel to the b-axis, while the base vectors (Co(2)) are canted by 34° and aligned in an opposite direction to the vertex vectors. The spins in parallel adjacent chains align in opposite directions, creating an overall antiferromagnetic structure. At a 3 kOe applied magnetic field, adjacent chains flip by 180° to generate a ferrimagnetic phase. An increase in field gradually induces the Co(1) moment to rotate along the b-axis and align in the same direction with Co(2) generating a ferromagnetic structure. The antiferromagnetic exchange parameters are calculated to be J_bb = 0.028 meV and J_bv = 0.13 meV, while the interchain exchange parameter is considerably weaker at J_ch = (0.0047/N_ch) meV. Our results demonstrate that the CsCo₂(MoO₄)₂(OH) is a promising candidate to study new physics associated with sawtooth chain magnetism and it encourages further theoretical studies as well as the synthesis of other sawtooth chain structures with different magnetic ions.

更新日期：2023-02-17

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