论文标题
hob $ _ {2} $的巨型磁平衡性能中的dy替代效果
Effect of Dy substitution in the giant magnetocaloric properties of HoB$_{2}$
论文作者
论文摘要
最近，在铁磁材料hob $ _ {2} $中，已经报道了氢液化温度附近的巨大磁世效应。在这里，我们研究了DY替代的影响，在Ho $ _ {1-x} $ dy $ _ {x} $ b $ _ {2} $ Alloys（$ \ textIt {x} $ = 0，0.3，0.5，0.5，0.7，0.7，1.0）的磁性属性中的影响。我们发现curie温度（$ \ textIt {t} $$ _ {c} $）在dy替代时逐渐升高，而磁熵的大小会更改| $δ\ textit {s} _ {m} _ {m} $ | at $ \ textit {t} $ = $ \ textit {t} _ {c} $从0.35降低至0.15 j cm $^{ - 3} $ k $^{ - 1} $ 5 t的场更改。 |$Δ\textit{S}_{M}$|, the refrigerant capacity ($\textit{RC}$) and refrigerant cooling power ($\textit{RCP}$) remains almost constant in all doping range, which as large as 5.5 J cm$^{-3}$ and 7.0 J cm$^{-3}$ for a field change of 5 T. These结果表明，这一系列合金可能是在10-50 K之间的温度范围内磁制冷的令人兴奋的候选者。
Recently, a massive magnetocaloric effect near the liquefaction temperature of hydrogen has been reported in the ferromagnetic material HoB$_{2}$. Here we investigate the effects of Dy substitution in the magnetocaloric properties of Ho$_{1-x}$Dy$_{x}$B$_{2}$ alloys ($\textit{x}$ = 0, 0.3, 0.5, 0.7, 1.0). We find that the Curie temperature ($\textit{T}$$_{C}$) gradually increases upon Dy substitution, while the magnitude of the magnetic entropy change |$Δ\textit{S}_{M}$| at $\textit{T}$ = $\textit{T}_{C}$ decreases from 0.35 to 0.15 J cm$^{-3}$ K$^{-1}$ for a field change of 5 T. Due to the presence of two magnetic transitions in these alloys, despite the change in the peak magnitude of |$Δ\textit{S}_{M}$|, the refrigerant capacity ($\textit{RC}$) and refrigerant cooling power ($\textit{RCP}$) remains almost constant in all doping range, which as large as 5.5 J cm$^{-3}$ and 7.0 J cm$^{-3}$ for a field change of 5 T. These results imply that this series of alloys could be an exciting candidate for magnetic refrigeration in the temperature range between 10-50 K.
