Abstract
The magnetic properties, phase transitions, and related magnetocaloric effects in Mn1−xFexCoGe (x=0.12, 0.13) have been studied using magnetization and differential scanning calorimetry measurements. Instead of single first-order magnetostructural transition, two-step transitions have been detected in our studied system: one is second-order character followed by a first-order phase transition at lower temperature. The observed first-order phase transition as dominated by the crystallographic transition arises due to the coincidence of martensitic transformation with magnetic changes below the second-order magnetic phase transition in Mn1−xFexCoGe. Large magnetic entropy changes (−ΔSM) have been observed in our studied system due to a first-order phase transition between two high magnetization states. The estimated value of −ΔSM for x=0.12 (−ΔSM=16.5J/kgK for ΔH=5T around 242K) is comparable to the giant-magnetocaloric materials, such as Gd5Si2Ge2 and MnFeP0.45As0.55, which undergo a disorder-to-order magnetostructural transition.
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