Magnetostriction and heat-capacity study on the metamagnetic phase transition of Dy2In1-xAlx alloys

Magnetostriction and heat-capacity study on the metamagnetic phase transition of Dy2In1-xAlx alloys
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Dy2In1-xAlx合金变磁相变的磁致伸缩和热容研究

DOI:
10.1063/9.0000361
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发表时间:
2022-03
期刊:
影响因子:
1.6
通讯作者:
Weibin Cui
Weibin Cui
中科院分区:
材料科学4区
文献类型:
--
作者:
Shiqi Wang;Pu Liu;Jiamin Chen;Weibin Cui

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在Dy 2In1-xAlx(x = 0,0.2,0.3,0.4)合金中,当x = 0.3为临界成分时,六方结构逐渐转变为正交结构。Dy2In0.7Al0.3合金在7 T相变温度附近出现最大磁熵变和最大饱和磁致伸缩,其磁致伸缩值为<$995ppm,表现出典型的强磁弹性耦合。从热容(Cp)的测量中,观察到Dy 2In1-xAlx(x = 0,0.2和0.3)合金的Cp- T曲线上有一个尖锐的峰。同时,从Cp/T-T2曲线可以看出,Al对In的替代量越大,合金的费米能级附近的态密度越低。对于7 T的场,最大Δ Tad从Dy 2 In中的6.5K略微增加到Dy 2 In 0.7Al 0.3中的7 K。
In Dy 2 In 1-x Al x (x = 0, 0.2, 0.3 and 0.4) alloys, the hexagonal structure is gradually transformed into orthorhombic one with x = 0.3 as the critical composition. In Dy 2 In 0.7 Al 0.3 alloy, the highest magnetic entropy change is accompanied with highest saturation magnetostriction ∼995 ppm under 7 T near phase transition temperature, indicating the typical strong magnetoelastic coupling. From heat-capacity ( C p ) measurement, a sharp peak is observed on the C p - T curves for Dy 2 In 1-x Al x (x = 0, 0.2 and 0.3) alloys. Meanwhile, more Al substitution for In leads into the reduced density of state near Fermi level of each alloy judged from C p /T - T 2 curves. The maximized ΔT ad for a field of 7 T is slightly increased from 6.5 K in Dy 2 In to 7 K in Dy 2 In 0.7 Al 0.3 .
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