Effect of microstrain on the magnetism and magnetocaloric properties of MnAs0.97P0.03

Effect of microstrain on the magnetism and magnetocaloric properties of MnAs0.97P0.03
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微应变对MnAs0.97P0.03磁性和磁热性能的影响

DOI:
10.1063/1.3695039
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发表时间:
2012-03
影响因子:
4
通讯作者:
F Liu
F Liu
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
YB Gao;ZQ Cai;司平占;BS Du;NK Sun;SN Xu;F Liu

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在机械球磨制备的化合物MnAs0.97P0.03中,X射线衍射定量分析计算出0.68%的大应变,在低温下诱导出可恢复的日磁状态,并抑制了温度/场诱导的正交-六方相变。这使得居里温度TC处的热滞和磁滞均显著减小。在日磁-铁磁转变温度附近和TC处,观察到了较大的逆磁热效应,其磁熵变ΔSm在2 0 8 K时为5.6 J/kg K,在2 5 3 K时其ΔSm为4.4 J/kg K,而在5 T场变时,其ΔSm为4.4−J/kg K。热处理后的MnAs0.97P0.03在室温附近有较大的磁致伸缩效应,ΔSm为∼14 J/kgK,磁场变化范围为0~5 T。
In the compound MnAs0.97P0.03, prepared by mechanical milling, a large microstrain of 0.68%, calculated by quantitative x-ray diffraction analysis, induces a recoverable helimagnetic state at low temperatures and suppresses the temperature/field-induced orthorhombic-hexagonal phase transition. This leads to a remarkable reduction of both the thermal and the magnetic hysteresis at the Curie temperature, TC. Around the helimagnetic-ferromagnetic transition temperature and at TC, a large inverse magnetocaloric effect (MCE) with magnetic entropy change ΔSm of 5.6 J/kg K at 208 K and a normal MCE with ΔSm of −4.4 J/kg K at 253 K for a 5 T field change are observed. After annealing, MnAs0.97P0.03 exhibits a large MCE near room temperature with ΔSm of ∼14 J/kg K for a field change from 0 to 5 T.
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