Magnetic phase transitions and entropy change in layered NdMn1.7Cr0.3Si2

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AIP Publishing
A giant magnetocaloric effect has been observed around the Curie temperature, TC ∼ 42 K, in NdMn1.7Cr0.3Si2 with no discernible thermal and magnetic hysteresis losses. Below 400 K, three magnetic phase transitions take place around 380 K, 320 K and 42 K. Detailed high resolution synchrotron and neutron powder diffraction (10–400 K) confirmed the magnetic transitions and phases as follows: TN intra ∼ 380 K denotes the transition from paramagnetism to intralayer antiferromagnetism (AFl), TN inter ∼ 320 K represents the transition from the AFl structure to the canted antiferromagnetic spin structure (AFmc), while TC ∼ 42 K denotes the first order magnetic transition from AFmc to canted ferromagnetism (Fmc + F(Nd)) due to ordering of the Mn and Nd sub-lattices. The maximum values of the magnetic entropy change and the adiabatic temperature change, around TC for a field change of 5 T are evaluated to be −ΔSM max ∼ 15.9 J kg−1 K−1 and ΔTad max ∼ 5 K, respectively. The first order magnetic transition associated with the low levels of hysteresis losses (thermal <∼0.8 K; magnetic field <∼0.1 T) in NdMn1.7Cr0.3Si2 offers potential as a candidate for magnetic refrigerator applications in the temperature region below 45 K. ©, AIP Publishing LLC.
Hysteresis, Antiferromagnetism, Synchrotrons, Entropy, Spin
Md Din, M. F., Wang, J. L., Campbell, S. J., Studer, A. J., Avdeev, M., Kennedy, S. J., Gu, Q. F., Zeng, R, & Dou, S. X. (2014). Magnetic phase transitions and entropy change in layered NdMn1.7Cr0.3Si2. Applied Physics Letters, 104(4), 042401. doi:10.1063/1.4863230