Abstract
Zero field muon spin rotation and relaxation $(\ensuremath{\mu}\mathrm{SR})$ measurements on a single crystal of orthorhombic $\mathrm{Pr}\mathrm{Co}{\mathrm{Al}}_{4}$ revealed the presence of spontaneous static fields, extending above the well-known incommensurately modulated antiferromagnetic structure $({T}_{N}=17\phantom{\rule{0.3em}{0ex}}\mathrm{K})$ up to at least $110\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. Two further transitions at $30\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ and $84\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ were clearly visible. The spontaneous fields above ${T}_{N}$ are confined to the $(b,c)$ plane and are tentatively ascribed to a spin density wave involving the Co $3d$-band electrons.
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