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Magnetic order and spin dynamics across a ferromagnetic quantum critical point:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>μ</mml:mi><mml:mi>SR</mml:mi></mml:mrow></mml:math>investigations of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>YbNi</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:msub><mml:mi mathvariant="normal">P</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi…
In the quasi-one-dimensional heavy-fermion system ${\mathrm{YbNi}}_{4}{({\mathrm{P}}_{1\ensuremath{-}x}{\mathrm{As}}_{x})}_{2}$ the presence of a ferromagnetic (FM) quantum critical point (QCP) at ${x}_{\mathrm{c}} \ensuremath{\approx}0.1$ with unconventional quantum critical exponents in the thermodynamic properties has been recently reported. Here, we present muon-spin relaxation ($\ensuremath{\mu}\mathrm{SR}$) experiments on polycrystals of this series to study the magnetic order and …