Electronic and structural properties of palladium-based Heusler superconductors

详细信息	查看全文 | 推荐本文 |

• 作者：Jü ; rgen Winterlik ; Gerhard H. Fecher ; Claudia Felser
• 关键词：A. Heusler compounds ; C. Electronic structure ; D. Superconductivity
• 刊名：Solid State Communications
• 出版年：2008
• 期刊代码：101_00381098
• 类别：ms
• 出版时间：March 2008
• 卷：145
• 期：9-10
• 页码：475-478
• 文件大小：473 K

摘要

This work reports on superconductivity in the Heusler compounds Pd₂ZrAl and Pd₂HfAl. Magnetisation and resistance measurements were carried out to verify their superconducting states. The compounds exhibit transition temperatures of 3.2 K (Zr) and 3.4 K (Hf). From their behaviour in external magnetic fields, it was determined that both compounds are type II superconductors. Similar to the half-metallic ferromagnets, the superconducting Heusler compounds follow an electron counting scheme based on theoretical considerations. As found from ab initio calculations, the superconductivity can be explained by a valence instability at the L-point, that has been used as design criterion.