Electrical resistivity of pyrochlore compounds R2Mo2O7(R =Nd, Sm, Gd, Tb, Y)
Electrical resistivity of pyrochlore compounds R2Mo2O7(R =Nd, Sm, Gd, Tb, Y)
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烧绿石化合物R2Mo2O7的电阻率(R =Nd, Sm, Gd, Tb, Y)
DOI：
10.1016/0022-4596(87)90316-1
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发表时间：
1987
影响因子：
3.3
通讯作者：
W. R. Datars
中科院分区：
文献类型：
--
作者：
J. Greedan;M. Sato;N. Ali;W. R. Datars
在4.2 ~ 300 K温度范围内测量了R_2Mo_2O_7（R =Nd，Sm，Gd，Tb，Y）高温超导体的电阻率。金属行为观察到的Nd 2 Mo 2 O 7，Sm 2 Mo 2 O 7，和Gd 2 Mo 2 O 7具有相对较高的磁有序温度，由于铁磁性的钼亚晶格。对于所有金属材料，在磁有序点附近观察到电阻率的明显下降。在低温下观察到的电阻最小值，这可能是由于稀土亚晶格的磁有序，是不完全理解。Tb_2Mo_2O_7和Y_2Mo_2O_7在4.2K以下没有钼亚晶格有序化，是半导体。然而，电阻率的温度依赖性不是指数的。这种不寻常的电阻率行为是典型的简并半导体。
The electrical resistivity ofR2Mo2O7(R =Nd, Sm, Gd, Tb, Y) pyrochlores was measured in the temperature range 4.2 to 300 K. Metallic behavior is observed for Nd2Mo2O7, Sm2Mo2O7, and Gd2Mo2O7which have relatively high magnetic ordering temperatures due to ferromagnetism on the molybdenum sublattice. A clear drop in resistivity is observed near the magnetic ordering point for all metallic materials. A resistance minimum observed at low temperatures, which may be due to the magnetic ordering of the rare-earth sublattice, is not completely understood. Tb2Mo2O7and Y2Mo2O7, which show no molybdenum sublattice ordering down to 4.2 K, are semiconductors. However, the temperature dependence of the resistivity is not exponential. This unusual resistivity behavior is typical of degenerate semiconductors.