Comparative study of anisotropic superconductivity in CaAlSi and CaGaSi

✍ Scribed by T. Tamegai; K. Uozato; S. Kasahara; T. Nakagawa; M. Tokunaga

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 322 KB
• Volume: 426-431
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2005.01.020

✦ Synopsis

In order to get some insight into the origin of the anomalous angular dependence of H c2 in a layered intermetallic compound CaAlSi, electronic, superconducting, and structural properties are compared between CaAlSi and CaGaSi. The angular dependence of H c2 in CaGaSi is well described by the anisotropic GL model. Parallel to this finding, the pronounced lattice modulation accompanying the superstructure along the c-axis in CaAlSi is absent in CaGaSi. A relatively large specific heat jump at the superconducting transition in CaAlSi compared with CaGaSi indicates the presence of strong electron-phonon coupling in CaAlSi, which may cause the superstructure and the anomalous angular dependence of H c2 .