Quasi two-dimensional magnetism in spin-$\frac{1}{2}$ square lattice compound Cu[C$_6$H$_2$(COO)$_4$][H$_3$N-(CH$_2$)$_2$-NH$_3$]$\cdot$3H$_2$O

S. Guchhait; S. Baby; M. Padmanabhan; A. Medhi; R. Nath

doi:10.1209/0295-5075/133/57006

paper

Quasi two-dimensional magnetism in spin- $\frac{1}{2}$ square lattice compound Cu[C $_{6}$ H $_{2}$ (COO) $_{4}$ ][H $_{3}$ N-(CH $_{2}$ ) $_{2}$ -NH $_{3}$ ] $\cdot$ 3H $_{2}$ O

arXiv:2008.12899 · doi:10.1209/0295-5075/133/57006

Abstract

We report the crystal growth and structural and magnetic properties of quasi two-dimensional $S = 1/2$ quantum magnet Cu[C $_{6}$ H $_{2}$ (COO) $_{4}$ ][H $_{3}$ N-(CH $_{2}$ ) $_{2}$ -NH $_{3}$ ] $\cdot$ 3H $_{2}$ O. It is found to crystallize in a monoclinic structure with space group $C 2/ m$ . The CuO $_{4}$ plaquettes are connected into a two-dimensional framework in the $ab$ -plane through the anions of [C $_{6}$ H $_{2}$ (COO) $_{4}$ ] $^{4 -}$ (pyromellitic acid). The [H $_{3}$ N-(CH $_{2}$ ) $_{2}$ -NH $_{3}$ ] $^{2 +}$ $\cdot$ 3H $_{2}$ O groups are located between the layers and provide a weak interlayer connection via hydrogen (H...O) bonds. The temperature dependent magnetic susceptibility is well described by $S = 1/2$ frustrated square lattice ( $J_{1} - J_{2}$ ) model with nearest-neighbor interaction $J_{1} / k_{B} ≃ 5.35$ K and next-nearest-neighbor interaction $J_{2} / k_{B} ≃ - 0.01$ K. Even, our analysis using frustrated rectangular lattice ( $J_{1 a, b} - J_{2}$ ) model confirms almost isotropic nearest-neighbour interactions ( $J_{1a} / k_{B} ≃ 5.31$ K and $J_{1b} / k_{B} ≃ 5.38$ K) in the $ab$ -plane and $J_{2} / k_{B} ≃ - 0.24$ K. Further, the isothermal magnetization at $T = 1.9$ K is also well described by a non-frustrated square lattice model with $J_{1} / k_{B} ≃ 5.2$ K. Based on the $J_{2} / J_{1}$ ratio, the compound can be placed in the Néel antiferromagnetic state of the $J_{1} - J_{2}$ phase diagram. No signature of magnetic long-range-order was detected down to 2 K.

arXiv comment8 pages, 4 figures, 3 tables

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Abstract

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Cited by in corpus (1)

Quasi two-dimensional magnetism in spin- $\frac{1}{2}$ square lattice compound Cu[C $_{6}$ H $_{2}$ (COO) $_{4}$ ][H $_{3}$ N-(CH $_{2}$ ) $_{2}$ -NH $_{3}$ ] $\cdot$ 3H $_{2}$ O