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Benbow, Evan M.
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article
Influence of the La/M Network on Magnetic Properties of Mn4 Tetrahedra in Intermetallic Compounds La21−δMn8M7C12 (M = Ge, Sn, Sb, Te, Bi)
Abstract
Crystals of La21−δMn8M7C12 (M = main group elements Ge/Al, Sn, Sb, Te, Bi) were synthesized in La/Ni eutectic flux. The structure features tetrahedral manganese clusters edge-capped by carbon atoms, Mn4C6, embedded into a nonmagnetic La/M network. The structures were determined from single-crystal X-ray diffraction (La21Mn8Ge6.2Al0.8C12, Fm3m; a = 16.2259(3) A; Z = 4; R1 = 0.022). While most of the La21Mn8M7C12 analogues are completely ordered, the M = Te compound features partial occupancy of one of the La sites, and the M = Ge analogue exhibits mixed Ge/Al occupancy on one of the M sites. La21−δMn8M7C12 with M = Sn, Sb, Te, Bi are paramagnets, but the susceptibility of La21Mn8Ge6.2Al0.8C12 exhibits ZFC-FC divergence at T1 ≈ 6 K and an additional feature at T2 ≈ 3 K. Such behavior is indicative of frustration of antiferromagnetically coupled manganese magnetic moments within the Mn4 tetrahedra. AC susceptibility measurements confirm the presence of two cusps at T1 and T2; however, no frequency dependenc...