Magnetic field-tuned Fermi liquid formation in Mn0.75Fe0.25SiMn0.75Fe0.25Si

• Doping driven paramagnon spin fluctuation assisted non-Fermi liquid behavior in quarter Fe doped MnSi, i.e  ., Mn0.75Fe0.25SiMn0.75Fe0.25Si.
• Unusual magnetic field-induced quantum critical phenomenon (crossover from non-Fermi liquid to Fermi liquid).
• Non-Kondo route to achieve non-Fermi liquid with moderate heavy Sommerfeld coefficient.
• 3d-transition metal derived paramagnetic compound to possess bench mark value of originally proposed Kadowaki–Wood's ratio.

Low temperature ground state properties of Mn0.75Fe0.25SiMn0.75Fe0.25Si are investigated based on temperature and magnetic field dependent behavior of specific heat and resistivity. Paramagnon spin fluctuations assisted non-Fermi liquid is suppressed by magnetic fields and gradual evolution of Fermi liquid is demonstrated. The tendency of magnetic field-induced crossover from non-Fermi to Fermi liquid behavior is illustrated by suitable magneto-specific heat scaling which reveals unusual quantum critical phenomenon in a 3d   transition metal derived paramagnetic compound. In the absence of magnetic fields, Kadowaki–Wood's Ratio (KWR) A/γ2A/γ2 is about 8.5μΩcmmol2K2J−2 which is 85% close to the originally proposed KWR and reaches 100% under the moderate magnetic fields of 0.7 T.

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