Spiral spin cluster in the hyperkagome antiferromagnet Mn3RhSi

Local Local spin correlation orders emerge in a paramagnetic state, with notable examples such as the partial order, cooperative paramagnetism, and soliton spin liquid. The noncentrosymmetric intermetallic antiferromagnet Mn3RhSi also exhibits the local spin correlation order in the paramagnetic state as magnetic short-range order in a wide temperature range. Here, we show that the local spin correlation order has a spiral structure by neutron scattering measurement of a Mn3RhSi single crystal. The possible origins of the magnetic cluster formation are discussed in terms of the Lifshitz invariant and the Griffiths phase, and compared with the room-temperature skyrmion phase of Co7Zn7Mn6 and non-Fermi liquid behavior of beta-Mn.

Automated summary

Local spin correlation orders, including partial order, cooperative paramagnetism, and soliton spin liquid, emerge in the paramagnetic state of the noncentrosymmetric intermetallic antiferromagnet Mn3RhSi. The study reveals that the local spin correlation order in Mn3RhSi has a spiral structure. The possible origins of magnetic cluster formation are discussed in relation to the Lifshitz invariant and the Griffiths phase, and compared with other materials.