Ferromagnetic ordering of linearly coordinated Co ions in LiSr2[CoN2]
Abstract
LiSr2[CoN2] single crystals were successfully grown out of Li-rich flux. Temperature- and field-dependent measurements of the magnetization in the range of T = 2 - 300 K and up to μ0H = 7 T as well as measurements of the heat capacity are presented. Ferromagnetic ordering emerges below TC = 44 K and comparatively large coercivity fields of μ0H = 0.3 T as well as pronounced anisotropy are observed upon cooling. Polycrystalline samples of the Ca analog LiCa2[CoN2] were obtained and investigated in a similar way. In both compounds Co manifests orbital contributions to the magnetic moment and large single-ion anisotropy that is caused by second-order Spin-orbit coupling. Quantum chemistry calculations reveal a magnetic anisotropy energy of 7 meV, twice as large as the values reported for similar Co d8 systems.
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