Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Postersession Superconductivity: Materials - Fabrication and Properties
TT 5.3: Poster
Montag, 23. März 2009, 13:00–16:45, P1A
Substitution and pressure effect on superconducting properties of Na1−xCaxAlSi — •Andreea Beleanu1, Vadim Ksenofontov1, Claudia Felser1, and Petre Badica2 — 1Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg - University, 55099 Mainz — 2Institute of Physics Johannes Gutenberg - University, 55099 Mainz
This work reports on the substitution of Na+ with Ca2+ in the ternary alkali-metal silicide superconductor NaAlSi. The superconducting transition of NaAlSi takes place at a critical temperature Tc of 7 K. The superconducting properties of CaAlSi were reported to the distortion of the AlSi-layers. The Si bonding network thus plays an important role for the superconducting characteristics[1]. CaAlSi shows a superconducting transition at a Tc of 8.0 K [2]. Na+ and Ca2+ cations have equal ionic radii but Ca provides an additional electron. The observation of the superconducting properties in dependence of electron-doping of Na1−xCaxAlSi is shown. The superconducting properties of Na1−xCaxAlSi were measured using SQUID magnetometry.
[1] S. Kuroiwa, H. Kawashima, H. Kinoshita, H. Okabe, J. Akimitsu, Physica C, 466, 11 (2007).
[2] M. Imai, K. Nishida, T. Kimura, H. Kitazawa, H. Abe, H. Kito, K. Yoshii, arXiv:cond-mat/0210692v1,(2002)