Spin fluctuations in Cr doped MnSi

Transport and calorimetric properties of Mn1−xCrxSi (x = 0.025) down to 2 K and magnetic fields up to 13 T are reported. Electrical resistivity in zero field as well as in magnetic fields, below a magnetic transition temperature, Tc = 23.6 K could be described using a T2 term with large coefficient, invoking the role of spin fluctuations. Sommerfeld coefficient 'γ' of specific heat is an enhanced one as compared to the pure MnSi. Negative magnetoresistance (35% at 13 T) with maximum at Tc and a decrease in coefficient of T2 term in resistivity suggests the suppression of spin fluctuations in high magnetic fields. This is further supported by negative magneto-specific heat in the vicinity of Tc coupled with a decrement in the Sommerfeld coefficient 'γ' of specific heat under a field of 10 T. Kadowaki-Woods ratio places the system close to other systems showing strong spin fluctuations.