Correlation between crystal structures of CaAlSi with and without superlattice and superconducting properties

S. Kuroiwa; H. Sagayama; T. Kakiuchi; H. Sawa; Y. Noda; J. Akimitsu

doi:10.1103/PhysRevB.74.014517

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Correlation between crystal structures of CaAlSi with and without superlattice and superconducting properties

S. Kuroiwa, H. Sagayama, T. Kakiuchi, H. Sawa, Y. Noda, J. Akimitsu

DOI 10.1103/PhysRevB.74.014517 · Physical Review B

T1

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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)∕kBTc and ΔCel∕γNTc 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CaAlSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.45	Pressure not reported	midpoint
CaAlSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.45	Pressure not reported	midpoint
CaAlSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.5	Pressure not reported	unknown
CaAlSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.83	Pressure not reported	midpoint
CaAlSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.83	Pressure not reported	midpoint
CaAlSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.68	Pressure not reported	unknown
CaAlSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.75	Pressure not reported	midpoint
CaAlSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.75	Pressure not reported	midpoint
CaAlSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.67	Pressure not reported	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39	Pressure not reported	unknown