Tuning of magnetic frustration in $S=1/2$ Kagom\'{e} 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
| Autor: | Ajeesh, M. O., Yogi, A., Padmanabhan, M., Nath, R. |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Solid State Communications 207, 16 (2015) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.ssc.2015.01.018 |
| Popis: | Single crystalline and polycrystalline samples of $S=1/2$ Kagom\'{e} lattices {[Cu$_{3}$(CO$_{3}$)$_{2}$$(bpe)_{3}$](ClO$_{4}$)$_2$}$_{n}$ and {[Cu$_{3}$(CO$_{3}$)$_{2}$$(bpy)_{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$_4$ Kagom\'{e} layers in the $ab$-plane but linked along $c$ direction through either rigid $bpy$ or flexible $bpe$ ligands to form 3D frame works. Magnetic measurements reveal that both the compounds undergo ferromagnetic ordering ($T_{\rm C}$) at low temperatures and the $T_{\rm C}$ and the extent of frustration could be tuned by changing the nature of the pillar ligands. {[Cu$_{3}$(CO$_{3}$)$_{2}$$(bpe)_{3}$](ClO$_{4}$)$_2$}$_{n}$ which is made up of flexible $bpe$ ligands has a $T_{\rm C}$ of 5.7 K and a Curie-Weiss temperature ($\theta_{\rm CW}$) of -39.7 K giving rise to a frustration parameter of $\frac{|\theta_{\rm CW}|}{T_{\rm C}} \simeq$ 6.96. But the replacement of $bpe$ by a more rigid and electronically delocalized $bpy$ ligand leads to an enhanced $T_{\rm C} \simeq$ 9.3 K and a reduced frustration parameter of $\frac{|\theta_{\rm CW}|}{T_{\rm C}} \simeq$ 3.54. Comment: 6 pages, 6 figures, 1 table, Submitted to Solid State Communications |
| Databáze: | arXiv |
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