Conventional phase transitions are well understood in terms of the order parameter, based on the Landau–Ginzburg–Wilson theory. However, unconventional magnetic orders have been observed in clean systems such as MnSi. The unconventional magnetic orders of conduction electrons in the metallic phase has been observed for high-temperature superconductors and heavy fermion compounds. However, these unconventional magnetic orders have been limited to relatively low temperatures as quantum phase transitions. Here high-temperature magnetic short-range order is observed as one of the unconventional magnetic orders at temperatures up to 720 K in a noncentrosymmetric intermetallic antiferromagnet Mn₃RhSi with a well-ordered lattice. The magnetic Mn ions form a hyperkagome network of corner-sharing triangles, where the spins are geometrically frustrated. The spin network is equivalent to that of a spin liquid and non-Fermi-liquid material, β-Mn. Our observation indicates that a metallic phase with magnetic short-range order exists at high temperatures.

基于Landau–Ginzburg–Wilson理论，常规的相变在阶跃参数方面得到了很好的理解。但是，在清洁系统（例如MnSi）中观察到了非常规的磁阶。对于高温超导体和重费米子化合物，已经观察到金属相中导电电子的非常规磁阶。但是，随着量子相变，这些非常规的磁阶已被限制在相对较低的温度下。在非中心对称金属间反铁磁体Mn _3中，高温磁短程阶是非常规磁阶之一，温度高达720K。RhSi晶格井井有条。磁性Mn离子形成角共享三角形的超kagome网络，自旋在几何上受挫。自旋网络等效于自旋液体和非费米液体材料β-Mn。我们的观察表明，在高温下存在具有磁性短程有序的金属相。