Ferromagnetic ordering of linearly coordinated Co ions in LiSr${}_2$[CoN${}_2$]

Abstract

LiSr${}_2$[CoN${}_2$] 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 ${\mu }_0\text{H}=7$ T as well as measurements of the heat capacity are presented. Ferromagnetic ordering emerges below $T_C=44$ K and comparatively large coercivity fields of ${\mu }_{0}H=0.3$ T as well as pronounced anisotropy are observed upon cooling. Polycrystalline samples of the Ca analog LiCa${}_2$[CoN${}_2$] 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 $d^8$ systems.

arXiv comment21 pages, 6 figures, 5 tables

References in corpus (11)

• Giant magnetic anisotropy and tunnelling of the magnetization in Li2(Li_{1-x}Fe_x)N
• Unquenched large orbital magnetic moment in NiO
• Band-filling effect on magnetic anisotropy using a Green's function method
• Single crystal growth from light, volatile, and reactive materials using lithium and calcium flux
• Single crystal growth and anisotropy of CeRuPO
• Ferromagnetism and superconductivity in P-doped CeFeAsO
• Alternating magnetic anisotropy of Li${}_2$(Li${}_{1-x}{T}_x$)N with $T$ = Mn, Fe, Co, and Ni
• Single crystal growth and anisotropic magnetic properties of Li${}_2$Sr[Li${}_{1-x}$Fe${}_x$N]${}_2$
• Extreme field-sensitivity of the magnetic tunneling in Fe-doped Li${}_3$N
• Spin-reversal energy barriers of 305 K for Fe${}^{2+}$ $d^6$ ions with linear ligand coordination
• Ferromagnetism or slow paramagnetic relaxation in Fe-doped Li${}_3$N?

Cited by in corpus (1)

• Li${}_2$Sr[MnN]${}_2$: a magnetically ordered, metallic nitride