We have used neutron-scattering and muon spin relaxation $\left(\mu \text{SR}\right)$ to investigate the structural and magnetic properties of the $\beta$ phase of elemental manganese doped with dilute amounts of indium. $\beta \text{-Mn}$ is an example of a topologically frustrated antiferromagnetically correlated metal—but which remains paramagnetic at all temperatures. The addition of In to $\beta \text{-Mn}$ results in a vast volume expansion of the lattice and would therefore be expected to have a major effect on the stability and localization of the Mn moment as observed in, for example, Ru- and Al-doped $\beta \text{-Mn}$ alloys. We find that In doping in $\beta \text{-Mn}$ results in a short-range ordered spin-glasslike ground state, similar to that of Al-doped $\beta \text{-Mn}$ but with residual low-frequency spin fluctuations. This is in contrast to Ru doping which results in the stabilization of a long-range-ordered Mn moment

• Received 30 July 2010

DOI:https://doi.org/10.1103/PhysRevB.82.144439