β-Mn：复杂结构中涌现的简单性
β-Mn: Emergent Simplicity in a Complex Structure
摘要：
研究了金属阻挫磁体β-MnCo中的低温自旋关联。单晶极化中子散射实验揭示了T=0.05 K时高结构磁散射的持续性和周期磁序的缺失。我们采用反向蒙特卡罗精化和平均场论模拟来构造一个简单的有效哈密顿量，它占磁散射。我们确定的相互作用描述了一个新兴的自旋结构，模仿三角晶格反铁磁体。在复杂的晶体结构中观察到一个简单的集体磁态是令人惊讶的，因为它扭转了简单晶格上多体相互作用产生的复杂涌现态的既定范式。我们认为，结构的复杂性可能会提供一种途径，实现相关的量子物质的新状态。
英文摘要：
We investigate low-temperature spin correlations in the metallic frustrated magnet β-MnCo. Single-crystal polarised-neutron scattering experiments reveal the persistence of highly-structured magnetic diffuse scattering and the absence of periodic magnetic order to T=0.05 K. We employ reverse Monte Carlo refinements and mean-field theory simulations to construct a simple effective Hamiltonian which accounts for the magnetic scattering. The interactions we identify describe an emergent spin structure which mimics the triangular lattice antiferromagnet. The observation of a simple collective magnetic state in a complicated crystal structure is surprising because it reverses the established paradigm of elaborate emergent states arising from many-body interactions on simple lattices. We suggest that structural complexity may provide a route to realising new states of correlated quantum matter.
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