Title: Contrasting magnetothermal conductivity in sibling Co-based honeycomb-lattice antiferromagnets Show Chinese title

Title: 具有Co基蜂窝状反铁磁体的对比磁热传导

Abstract: Honeycomb-lattice antiferromagnets have attracted wide attention for exploration of exotic heat transport and their interplay with magnetic excitations. In this work, we have revealed a contrasting behavior in the magneto-thermal conductivity (MTC) between two Co-based honeycomb-lattice magnets Co4M2O9 (M = Nb, Ta), despite their identical lattice structures and quite similar magnetism. Co4Ta2O9 exhibits enhanced MTC of about 550% at 9 T of an in-plane magnetic field, comparable to other honeycomb-magnets, while MTC for Co4Nb2O9 reaches only ~30%. This marked difference is ascribed to distinct features in the field-induced evolution of magnetic excitations that resonantly scatter phonons. This finding sheds light on implicit impacts of non-magnetic ions on thermal transport, and hints at the potential for broad heat-transport tunability while preserving magnetism and lattice structures. Show Chinese abstract

Abstract: 蜂窝状反铁磁体因其独特的热输运特性及其与磁激发的相互作用而引起了广泛关注。 在这项工作中，尽管两种基于钴的蜂窝状磁体 Co4M2O9 (M = Nb, Ta) 具有相同的晶格结构和非常相似的磁性，我们揭示了它们在磁热导率（MTC）方面的对比行为。 在面内磁场为 9 T 时，Co4Ta2O9 的 MTC 增强了约 550%，与其它蜂窝状磁体相当，而 Co4Nb2O9 的 MTC 仅达到约 30%。 这种显著差异归因于由磁场诱导的磁激发共振散射声子的不同特征。 这一发现揭示了非磁性离子对热输运的隐含影响，并暗示了在保持磁性和晶格结构的同时实现广泛热输运可调性的潜力。