Magnetic and transport properties of single-grain R-Mg-Zn icosahedral quasicrystals [R = Y, (Y1-xGdx), (Y1-xTbx), Tb, Dy, Ho, and Er]
Magnetic and transport properties of single-grain R-Mg-Zn icosahedral quasicrystals [R = Y, (Y1-xGdx), (Y1-xTbx), Tb, Dy, Ho, and Er]
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DOI：
10.1103/physrevb.59.308
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发表时间：
1999-01-01
影响因子：
3.7
通讯作者：
Dennis, K
中科院分区：
文献类型：
--
作者：
Fisher, IR;Cheon, KO;Dennis, K
本文报道了二十面体R-Mg-Zn（R = Y、Tb、Dy、Ho和Er）单颗粒大样品的去磁化强度、低交流磁化率和电阻率的测量结果。直流磁化强度和交流磁化率数据均表明二十面体Tb-Mg-Zn和Dy-Mg-Zn分别在T-f = 5.8和3.6 K时发生自旋玻璃态转变，而低温交流磁化率测量表明Ho-Mg-Zn和Er-Mg-Zn的T-f分别为1.95和1.3 K.对于（Y_（1-x）Tb_x）-Mg-Zn系列固溶体，其凝固温度T_f近似随x（2/3）变化。在相同的稀土浓度（x）下，（Y1-xGdx）-Mg-Zn固溶体的T-f值比（Y1-xTbx）-Mg-Zn固溶体的T-f值低，表明晶体电场效应引起的局域磁矩各向异性对T-f值的提高起着重要作用。另一方面，角度相关的研究表明，在实验不确定度范围内，T > T-f的去磁化是各向同性的。单颗粒样品的电阻率rho（T）仅弱地依赖于温度，具有小的负d rho/dT。的电阻率的绝对值落在150和200 μ Ω cm之间的范围内，这是明显低于以前报道的值为其他结晶稳定的二十面体准晶。[S0163-1829（99）05801-4]。
We report measurements of the de magnetization, the low-held ac magnetic susceptibility, and the electrical resistivity of large (up to 0.5 cm(3)) single-grain samples of icosahedral R-Mg-Zn (R = Y, Tb, Dy, Ho, and Er). The dc magnetization and ac magnetic susceptibility data both indicate that icosahedral Tb-Mg-Zn and Dy-Mg-Zn undergo a transition to a spin-glass state at T-f = 5.8 and 3.6 K, respectively, while low-temperature ac susceptibility measurements show that T-f = 1.95 and 1.3 K for Ho-Mg-Zn and Er-Mg-Zn, respectively. For the series of solid solutions (Y1-xTbx)-Mg-Zn, the freezing temperature T-f varies approximately as x(2/3). The (Y1-xGdx)-Mg-Zn solid solutions have lower T-f values than (Y1-xTbx)-Mg-Zn for the same magnetic rare-earth concentrations (x), indicating that local moment anisotropy caused by crystalline electric-field effects plays a significant role in increasing T-f. On the other hand, angular-dependent studies show that the de magnetization for T > T-f is isotropic within the experimental uncertainty. The electrical resistivity rho(T) of the single-grain samples is only weakly temperature dependent, with a small, negative d rho/dT. Absolute values of the resistivity fall in the range between 150 and 200 mu Omega cm, which is distinctly lower than the values previously reported for other thermodynamically stable icosahedral quasicrystals. [S0163-1829(99)05801-4].