High-pressure synthesis and properties of the Eu-substituted Ba8-xEuxSi46 clathrates

作者：Liu, Lihua; Song, Bensheng; Sun, Bing; Ma, Hongan; Ma, Xingqiao; Li, Yang^*

来源：Physica B: Condensed Matter , 2016, 485: 84-88.

DOI：10.1016/j.physb.2016.01.017

• Type-I Si clathrate
• Eu-substitution
• Superconductivity

There has been considerable interest in rare-earth doped silicon clathrate compounds in order to understand the relation between the 4f electron moment and superconductivity. The Eu-doped silicon clathrates Ba8-xEuxSi46 (x=0, 0.5 and 1) were synthesized by using high -temperature and high-pressure. Structure characterization and magnetic measurement show Eu atoms enter clathrate lattice to occupy Ba positions. X-ray powder diffraction data indicate that the cubic lattice parameter a decreases with Eu doping. The magnetic measurements for all samples were studied. The incorporation of magnetic Eu2+ into the lattice suppresses the superconductivity completely and induces the Curie-paramagnetic behavior at high temperature. The influences of Eu2+ magnetic moment on the properties of samples were discussed.

• 出版日期2016-3-15
• 单位吉林大学; 北京科技大学