Abstract
The ${}^{170}\mathrm{Yb}$ high pressure M\"ossbauer-effect technique has been used to investigate on a microscopic level the ground state properties of the ferromagnetic (FM) Kondo-lattice compound YbNiSn. Unlike general expectations, we find for $0\ensuremath{\le}p\ensuremath{\le}3\mathrm{GPa}$ a stable moment behavior while ${T}_{C}$ is enhanced to its maximum value. For $p>3\mathrm{GPa}$ we observe a gradual change of the FM state to a complex magnetic ground state. This is suggested to be due to a volume dependent competition between the anisotropy of the magnetic exchange interaction and the crystal electric field anisotropy.
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