A case study of bilayered spin-$1/2$ square lattice compound [VO(HCOO)$_2\cdot$(H$_2$O)]
| Autor: | Guchhait, S., Arjun, U., Anjana, P. K., Sahoo, M., Thirumurugan, A., Madhi, A., Skourski, Y., Koo, B., Sichelschmidt, J., Schmidt, B., Baenitz, M., Nath, R. |
|---|---|
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Phys. Rev. Materials 3, 104409 (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevMaterials.3.104409 |
| Popis: | We present the synthesis and a detail investigation of structural and magnetic properties of polycrystalline [VO(HCOO)$_2\cdot$(H$_2$O)] by means of x-ray diffraction, magnetic susceptibility, high-field magnetization, heat capacity, and electron spin resonance measurements. It crystallizes in a orthorhombic structure with space group $Pcca$. It features distorted VO$_6$ octahedra connected via HCOO linker (formate anions) forming a two-dimensional square lattice network with a bilayered structure. Analysis of magnetic susceptibility, high field magnetization, and heat capacity data in terms of the frustrated square lattice model unambiguously establish quasi-two-dimensional nature of the compound with nearest neighbour interaction $J_1/k_{\rm B} \simeq 11.7$~K and next-nearest-neighbour interaction $J_2/k_{\rm B} \simeq 0.02$~K. It undergoes a N\'eel antiferromagnetic ordering at $T_{\rm N} \simeq 1.1$~K. The ratio $\theta_{\rm CW}/T_{\rm N} \simeq 10.9$ reflects excellent two-dimensionality of the spin-lattice in the compound. A strong in-plane anisotropy is inferred from the linear increase of $T_{\rm N}$ with magnetic field, consistent with the structural data. Comment: 9 pages, 7 figures, 1 table |
| Databáze: | arXiv |
| Externí odkaz: |
|