Evidence for Strong Quadrupolar Pair Interactions in Rare-Earth Palladium Bronzes RPd3S4
Evidence for Strong Quadrupolar Pair Interactions in Rare-Earth Palladium Bronzes RPd3S4
复制标题
稀土钯青铜 RPd3S4 中强四极对相互作用的证据
DOI：
10.1103/physrevlett.83.5366
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发表时间：
1999
影响因子：
8.6
通讯作者：
M. Ishikawa
中科院分区：
文献类型：
--
作者：
K. Abe;J. Kitagawa;N. Takeda;M. Ishikawa
我们报告了一个有序的证据，这是由于四极对相互作用，发生在RPd3S4的稀土(R)系列上，略高于它们的偶极磁序。比热测量证明，这些青铜器中的R离子具有高度简并的基态，这可能在低温下引起大的轨道效应。R系列两端的磁序温度远远超过De Gennes标度所预测的温度。事实表明，轨道效应在普通的交换型偶极相互作用中占主导地位。另一方面，假定的四极有序温度与R系列的平方史蒂文斯因子成正比，表明四极对通过传导电子的相互作用是有序的原因。
We report an evidence of order due to quadrupolar pair interactions, taking place along the rare-earth (R) series of RPd3S4 slightly above their dipolar magnetic order. Specific-heat measurements proved that the R ions in these bronzes possess highly degenerate ground states, which may cause large orbital effects at low temperatures. The magnetic ordering temperatures much exceed those predicted by the de Gennes scaling at both ends of the R series. The fact suggests that orbital effects dominate over the ordinary exchange-type dipolar interactions. The presumed quadrupolar ordering temperatures, on the other hand, scale with the squared Stevens factor along the R series, indicating that quadrupolar pair interactions via conduction electrons are responsible for the ordering.