Magnetic properties and exchange couplings of one-dimensionally arrayed 4f?3d heterometallic [Ln2Cu2]n compounds |
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| Authors: | Atsushi Okazawa Ryo Watanabe Hiroyuki Nojiri Takashi Nogami Takayuki Ishida |
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| Institution: | 1. Department of Applied Physics and Chemistry, The University of Electro-Communications, E6-819, Chofugaoka 1-5-1, Chofu, Tokyo 182-8585, Japan;2. Institute for Materials Research, Tohoku University, Katahira, Sendai 980-8577, Japan |
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| Abstract: | Heterometallic polymeric coordination compounds {Ln(hfac)2(CH3OH)}2{Cu(dmg)(Hdmg)}2]n (Ln2Cu2]n; Ln = Tb, Ho, and Er; H2dmg = dimethylglyoxime; Hhfac = 1,1,1,5,5,5-hexafluoropentane-2,4-dione) were synthesized, and the X-ray crystallographic analysis shows that their structures are isomorphous to those of the known ferrimagnetic Gd2Cu2]n and Dy2Cu2]n analogs. The exchange couplings in Tb2Cu2]n, Ho2Cu2]n, and Er2Cu2]n were precisely evaluated by high-frequency EPR and pulsed-field magnetization studies, giving JTb?Cu/kB = ?0.77(2) K, JHo?Cu/kB = ?0.250(12) K and JEr?Cu/kB = ?0.149(15) K. They were comparable to those of the Gd and Dy analogs. The absolute value of the exchange coupling parameter monotonically decreases in the order of Gd, Tb, Dy, Ho, and Er. |
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