Spin fluctuations in Cr doped MnSi

Abstract Transport and calorimetric properties of Mn 1−x Cr x Si ( 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, T c = 23.6 K could be described using a T 2 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 T c and a decrease in coefficient of T 2 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 T c 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.