Abstract
Anisotropic superconducting properties of new layered intermetallic compounds CaAlSi and CaGaSi with AlB 2 structure are studied. These superconductors show moderate anisotropy with anisotropy parameter [Formula: see text] determined by both magnetic and transport measurements. Despite the small value of γ, angular dependence of Hc2 in CaAlSi shows cusp-like feature for fields parallel to the superconducting plane, suggesting the presence of two-dimensional superconducting units. By contrast, Hc2(θ) in CaGaSi can be reasonably well explained by the anisotropic GL-model. X-ray diffraction measurements reveal the presence of superstructure along the c-axis in CaAlSi but not in CaGaSi . These findings suggest a close relationship between the anomalous angular dependence of Hc2 and the superstructure. Possible origins of the two-dimensional superconducting units in CaAlSi are discussed.
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More From: International Journal of Modern Physics B
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