Abstract
We have succeeded in growing a phase in CaAlSi with Al and Si atoms being distributed regularly in the AlSi layer corresponding to the B2 plane in the AlB2 -type structure without a superlattice along the c axis. The field-induced magnetic response in a phase exhibits an almost isotropic characteristic for the respective crystal axis. Moreover, the 2Δ(0) kB Tc and Δ Cel γN Tc estimated by heat capacity measurements are ∼3.5 and ∼1.4, respectively, indicating a BCS superconductor with a weak coupling. Although CaAlSi has a two-dimensional layered structure, these results strongly suggest that the superconductivity of the phase in CaAlSi is derived from a three-dimensional electronic ground state such as a conventional s -wave superconductor, which is markedly different from those of superstructured CaAlSi.
Original language | English |
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Article number | 014517 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 74 |
Issue number | 1 |
DOIs | |
Publication status | Published - Aug 3 2006 |
Externally published | Yes |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics