Coexistence of Commensurate and Incommensurate Antiferromagnetic Groundstates in CoNbSe Single Crystal
arXiv:2501.00591 · doi:10.1103/PhysRevMaterials.9.014403
Abstract
In CoNbSe, crystal symmetry, and cobalt site occupation drive the formation of two distinct magnetic phases. At , the centrosymmetric structure (6/) promotes Co-Co interactions leading to the formation of an -type antiferromagnetic structure phase with a transition temperature of = 169 K. At , the non-centrosymmetric structure (622) induces a lower-temperature magnetic phase with = 28 K. We report the coexistence of both substructures within a superlattice, with a nuclear propagation vector of (1/3, 1/3, 0) relative to the host lattice. Single crystals of CoNbSe exhibit both magnetic transitions, with corresponding to the phase and corresponding to the phase. Magnetic susceptibility and specific heat measurements confirm these transitions, although only the high-temperature phase significantly affects resistivity. We successfully isolate each phase in powder samples, while single crystals with an intercalation ratio of display the coexistence of both phases in a single sample. Using single-crystal neutron diffraction, we solved the magnetic structure of the high-temperature centrosymmetric phase (), and neutron powder diffraction revealed the double- magnetic structure of the low-temperature noncentrosymmetric phase ()
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