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Properties of [Fe4Cu2] magnetic cluster compound

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We have designed and synthesized a novel magnetic cluster containing low-spin (S = 1/2) Fe3+ and spin-1/2 Cu2+ ions, which incorporates competing ferromagnetic Fe–Cu interactions and antiferromagnetic Fe–Fe and Cu–Cu interactions. This is achieved with the help of a cyanido-bridged hexanuclear iron-copper cluster [{Fe(Tp)(CN)3}4{Cu(MePz)2}2] following the building block approach. All experiments were carried out using the stable compound, [{Fe(Tp)(CN)3}4{Cu(MePz)2}2], after removing the solvent molecules at 110°C for 2 h. Unusual magnetic interactions in this compound are revealed by the temperature- and field-dependent dc magnetic measurements. These magnetic measurements indicate the existence of ferromagnetic interactions between the low-spin Fe3+ and Cu2+ ions via cyanide bridge dominating magnetic properties over a wide temperature range below ~15 K. At a still lower temperature, magnetic properties appear to be controlled by an effective antiferromagnetic interaction, possibly arising from inter-cluster couplings. Frequency-dependent ac susceptibility measurements establish a possible glassy state emerging below 4 K.

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We are thankful to Prof. Per Nordblad for useful discussion and Akmal Hossain for the help in the analysis of magnetic data. This research work is supported by the Indian Institute of Science (IISc), Bangalore, India and the Scheme for Transformational and Advanced Research in Sciences (STARS, MHRD) (Project No: STARS/APR2019/CS/450/FS). SS and SM thank IISc, SK thanks the Council of Scientific and Industrial Research (CSIR), Government of India and SMH thanks the Department of Science and Technology (DST-RFBR, Indo-Russia Joint Research Funding, Project No: INT/RUS/RFBR/373) for their fellowship. DDS thanks the Science and Engineering Research Board, and Department of Science and Technology, Government of India, and Jamsetji Tata Trust for support of this research.

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Correspondence to D D Sarma.

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This article is part of the special issue on ‘Quantum materials and devices’.

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Shukla, S., Hossain, S.M., Mehta, S. et al. Properties of [Fe4Cu2] magnetic cluster compound. Bull Mater Sci 44, 229 (2021).

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