Superstructure-dependent electronic states in CaAlSi superconductors studied by angle-resolved photoemission spectroscopy
T. Sato, Y. X. Xiao, S. Souma, K. Nakayama, K. Sugawara, S. Kuroiwa, J. Akimitsu, T. Takahashi
DOI 10.1103/PhysRevB.91.195114 · Physical Review B
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Abstract
We have performed high-resolution angle-resolved photoemission spectroscopy on layered polymorph series of 1H−, 5H−, and 6H−CaAlSi, which exhibit superconductivity below 6.5, 5.7, and 7.7 K, respectively. While the overall band structure in the valence-band region is similar among these compounds, the volume of the Fermi surface at the M point and the magnitude of the superconducting gap are markedly different from each other. Implications of such variation in the electronic structure due to the superstructure along the c axis are discussed in relation to the physical properties of 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. | 6.5 | Pressure not reported | unknown |
| CaAlSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.7 | Pressure not reported | unknown |
| CaAlSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.7 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39.7 | Pressure not reported | unknown |
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