Tuning of magnetic frustration in $S=1/2$ Kagomé lattices {[Cu$_{3}$(CO$_{3}$)$_{2}$$(bpe)_{3}$](ClO$_{4}$)$_2$}$_{n}$ and {[Cu$_{3}$(CO$_{3}$)$_{2}$$(bpy)_{3}$](ClO$_{4}$)$_2$}$_{n}$ through rigid and flexible ligands

M. O. Ajeesh; A. Yogi; M. Padmanabhan; R. Nath

doi:10.1016/j.ssc.2015.01.018

paper

Tuning of magnetic frustration in $S = 1/2$ Kagomé lattices {[Cu $_{3}$ (CO $_{3}$ ) $_{2}$ $(b p e)_{3}$ ](ClO $_{4}$ ) $_{2}$ } $_{n}$ and {[Cu $_{3}$ (CO $_{3}$ ) $_{2}$ $(b p y)_{3}$ ](ClO $_{4}$ ) $_{2}$ } $_{n}$ through rigid and flexible ligands

arXiv:1409.5323 · doi:10.1016/j.ssc.2015.01.018

Abstract

Single crystalline and polycrystalline samples of $S = 1/2$ Kagomé lattices {[Cu $_{3}$ (CO $_{3}$ ) $_{2}$ $(b p e)_{3}$ ](ClO $_{4}$ ) $_{2}$ } $_{n}$ and {[Cu $_{3}$ (CO $_{3}$ ) $_{2}$ $(b p y)_{3}$ ](ClO $_{4}$ ) $_{2}$ } $_{n}$ , respectively were synthesized. Their structural and magnetic properties were characterized by means of x-ray diffraction and magnetization measurements. Both compounds crystalize in a hexagonal structure (space group $P - 6$ ) consisting of CuO $_{4}$ Kagomé layers in the $ab$ -plane but linked along $c$ direction through either rigid $b p y$ or flexible $b p e$ ligands to form 3D frame works. Magnetic measurements reveal that both the compounds undergo ferromagnetic ordering ( $T_{C}$ ) at low temperatures and the $T_{C}$ and the extent of frustration could be tuned by changing the nature of the pillar ligands. {[Cu $_{3}$ (CO $_{3}$ ) $_{2}$ $(b p e)_{3}$ ](ClO $_{4}$ ) $_{2}$ } $_{n}$ which is made up of flexible $b p e$ ligands has a $T_{C}$ of 5.7 K and a Curie-Weiss temperature ( $θ_{CW}$ ) of -39.7 K giving rise to a frustration parameter of $\frac{∣ θ _{CW} ∣}{T _{C}} ≃$ 6.96. But the replacement of $b p e$ by a more rigid and electronically delocalized $b p y$ ligand leads to an enhanced $T_{C} ≃$ 9.3 K and a reduced frustration parameter of $\frac{∣ θ _{CW} ∣}{T _{C}} ≃$ 3.54.

6 pages, 6 figures, 1 table, Submitted to Solid State Communications

Tuning of magnetic frustration in S=1/2 Kagomé lattices {[Cu3​(CO3​)2​(bpe)3​](ClO4​)2​}n​ and {[Cu3​(CO3​)2​(bpy)3​](ClO4​)2​}n​ through rigid and flexible ligands

Abstract

References in corpus (7)

Tuning of magnetic frustration in $S = 1/2$ Kagomé lattices {[Cu $_{3}$ (CO $_{3}$ ) $_{2}$ $(b p e)_{3}$ ](ClO $_{4}$ ) $_{2}$ } $_{n}$ and {[Cu $_{3}$ (CO $_{3}$ ) $_{2}$ $(b p y)_{3}$ ](ClO $_{4}$ ) $_{2}$ } $_{n}$ through rigid and flexible ligands