Structural and dynamical study of moment localization in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>β</mml:mi><mml:msub><mml:mrow><mml:mtext>-Mn</mml:mtext></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>In</mml:mtext></mml:mrow><mml:mi>x</mml:mi></mml:msub></mml:mrow></mml:math>

Abstract

We have used neutron-scattering and muon spin relaxation $(\ensuremath{\mu}\text{SR})$ to investigate the structural and magnetic properties of the $\ensuremath{\beta}$ phase of elemental manganese doped with dilute amounts of indium. $\ensuremath{\beta}\text{-Mn}$ is an example of a topologically frustrated antiferromagnetically correlated metal---but which remains paramagnetic at all temperatures. The addition of In to $\ensuremath{\beta}\text{-Mn}$ 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 $\ensuremath{\beta}\text{-Mn}$ alloys. We find that In doping in $\ensuremath{\beta}\text{-Mn}$ results in a short-range ordered spin-glasslike ground state, similar to that of Al-doped $\ensuremath{\beta}\text{-Mn}$ 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

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