arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1101.0879cond-mat.str-el
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铀重费米子化合物U PDMATHAAB Zn $_{17}$的磁场和压力

Magnetic Field and Pressure Phase Diagrams of Uranium Heavy-Fermion Compound U$_2$Zn$_{17}$

Naoyuki Tateiwa, Shugo Ikeda, Yoshinori Haga, Tatsuma D. Matsuda, Etsuji Yamamoto, Kiyohiro Sugiyama, Masayuki Hagiwara, Koichi Kindo, Yoshichika Onuki

摘要:

我们在高达53 T的高磁场下对布里奇曼法生长的铀重费米子化合物U $_2$ Zn $_{17}$单晶进行了磁化测量。在Néel温度$T_{\rm N}$ = 9.7 K以下的反铁磁态中,沿[11 $\bar{2}$ 0]方向($a$ -轴)的磁场在$H_c$ $\simeq$ 32 T处发现变磁转变.给出了沿[11 $\bar{2}$ 0]方向的磁场相图。磁化曲线示出在$H_m$ $\simeq$ 35 T下在高于$T_{\rm N}$的顺磁状态下直到磁化率或电阻率示出最大值的特征温度$T_{χ{\rm max}}$的非线性增加。在$H_m$的磁化的变磁性行为进行了讨论,在重费米子超导体UPt $_3$,URu $_2$ Si $_2$,和UPd $_2$ Al $_3$的变磁性的比较。我们还进行了高压电阻率测量U $_2$ Zn $_{17}$使用金刚石对顶砧电池高达8.7 GPa。惰性气体氩气被用作压力传递介质,以确保良好的流体静力学环境。Néel温度$T_{\rm N}$在4.7 GPa以下几乎与压力无关,并在较高压力区域开始增加。讨论了电阻率$A$、反铁磁间隙$Δ$和特征温度$T_{ρ{\rm max}}$中$T^2$项系数的压力依赖性。结果表明,与其它重费米子化合物相比,压力对U-$_2$-Zn $_{17}$电子态的影响很小.

英文摘要:

We have performed magnetization measurements at high magnetic fields of up to 53 T on single crystals of a uranium heavy-fermion compound U$_2$Zn$_{17}$ grown by the Bridgman method. In the antiferromagnetic state below the Néel temperature $T_{\rm N}$ = 9.7 K, a metamagnetic transition is found at $H_c$ $\simeq$ 32 T for the field along the [11$\bar{2}$0] direction ($a$-axis). The magnetic phase diagram for the field along the [11$\bar{2}$0] direction is given. The magnetization curve shows a nonlinear increase at $H_m$ $\simeq$ 35 T in the paramagnetic state above $T_{\rm N}$ up to a characteristic temperature $T_{χ{\rm max}}$ where the magnetic susceptibility or electrical resistivity shows a maximum value. This metamagnetic behavior of the magnetization at $H_m$ is discussed in comparison with the metamagnetic magnetism of the heavy-fermion superconductors UPt$_3$, URu$_2$Si$_2$, and UPd$_2$Al$_3$. We have also carried out high-pressure resistivity measurement on U$_2$Zn$_{17}$ using a diamond anvil cell up to 8.7 GPa. Noble gas argon was used as a pressure-transmitting medium to ensure a good hydrostatic environment. The Néel temperature $T_{\rm N}$ is almost pressure-independent up to 4.7 GPa and starts to increase in the higher-pressure region. The pressure dependences of the coefficient of the $T^2$ term in the electrical resistivity $A$, the antiferromagnetic gap $Δ$, and the characteristic temperature $T_{ρ{\rm max}}$ are discussed. It is found that the effect of pressure on the electronic states in U$_2$Zn$_{17}$ is weak compared with those in the other heavy fermion compounds.

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