Impact of the crystal electric field on magnetocaloric properties of CsGd(MoO4)2

[摘要] Magnetocaloric effect (MCE) was investigated in the single crystal of CsGd(MoO4)(2) in the temperature range from 2 to 30 K and fields up to 5 T applied along the easy and hard magnetic axis. The analysis of specific heat and magnetization provided the refinement of crystal electric field (CEF) parameters supporting the dominance of uniaxial symmetry. The knowledge of CEF energy levels enabled the extrapolation of MCE parameters outside the experimental region. Consequently, maximum values of the isothermal entropy change, -Delta S-M, in magnetic fields up to 5 T are expected to occur at temperatures between 1 and 2 K. While -Delta S-M achieves 19.2 J/kgK already for the field 1 T, for the field change 7 T, maximal -Delta S-M approximate to 26.8 J/kgK with a refrigerant capacity of 215 J/kg is expected. The absence of thermal hysteresis and the losses due to eddy currents as well as good chemical stability makes the compound CsGd(MoO4)(2) attractive for magnetic refrigeration at low temperatures. The possibilities of further enhancement of MCE parameters are discussed. (C) 2017 Elsevier B.V. All rights reserved.

[发布日期] 2017-12-30

[关键词] Magnetocaloric effect;Crystal electric field;Magnetic anisotropy;Specific heat;Rare-earth ion