Frustrated J1-J2 Diamond Lattice Antiferromagnet Co2Ti3O8 with a Vacancy-ordered Spinel Structure Synthesized via a Topochemical Reaction
Abstract
Metastable Co2Ti3O8 was synthesized through a topochemical reaction using Li2CoTi3O8 as the precursor, resulting in a vacancy-ordered spinel structure. Crystal structure analysis confirmed that Co ions selectively occupy the A-site, giving rise to a frustrated diamond lattice. Magnetic susceptibility and heat capacity measurements revealed antiferromagnetic order at 4.4 K, which is markedly suppressed compared to the negative Weiss temperature of -27 K, indicating a high degree of frustration effects. Pulsed high-field magnetization measurements revealed a four-step successive magnetic phase transition, demonstrating that Co2Ti3O8 is a promising candidate for a frustrated J1-J2 diamond lattice. Additionally, the J2/J1 ration estimated from the molecular field approximation suggests the possibility of a spiral ordered ground state. These observations highlight the potential of frustrated magnetism in ordered spinel structures to expand the material search space for quantum magnetism, including magnetic skyrmions.
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