Evidence of a spin-glass transition in the quasicrystal Al73Mn21Si6.

摘要: We give a definite answer to the question whether or not quasicrystal i-${\mathrm{Al}}_{73}$${\mathrm{Mn}}_{21}$${\mathrm{Si}}_{6}$ is true three-dimensional spin glass by measuring linear (${\mathrm{\ensuremath{\chi}}}_{\mathrm{ac}}$ and ${\mathrm{\ensuremath{\chi}}}_{\mathrm{dc}}$) dc nonlinear susceptibilities [${\mathit{A}}_{3}$(T),. . .]. show that magnetic correlations expand over large distances with decreasing T ${\mathit{A}}_{3}$(T) diverges following spin-glass transition scaling law finite ${\mathit{T}}_{\mathit{c}}$. From ${\mathit{A}}_{3}$ ${\mathrm{\ensuremath{\chi}}}_{\mathrm{dc}}$ we deduce separately in H=0 field limit number (1.3% of Mn concentration) moment (large, 7.5${\mathrm{\ensuremath{\mu}}}_{\mathit{B}}$) entities, which can be attributed clusters.