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Title: Magnetic phase transitions and entropy change in layered NdMn1.7Cr0.3Si2
Authors: Din, MFM
Wang, JL
Campbell, SJ
Studer, AJ
Avdeev, M
Kennedy, SJ
Gu, QF
Zeng, R
Dou, SX
Keywords: Hysteresis
Issue Date: 2014
Publisher: AIP Publishing
Citation: 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
Abstract: 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.
Gov't Doc #: 7221
ISSN: 1931-9401
Appears in Collections:Journal Articles

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