TY - JOUR
T1 - Superstructure-dependent electronic states in CaAlSi superconductors studied by angle-resolved photoemission spectroscopy
AU - Sato, T.
AU - Xiao, Y. X.
AU - Souma, S.
AU - Nakayama, K.
AU - Sugawara, K.
AU - Kuroiwa, S.
AU - Akimitsu, J.
AU - Takahashi, T.
N1 - Publisher Copyright:
© 2015 American Physical Society.
PY - 2015/5/11
Y1 - 2015/5/11
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.91.195114
DO - 10.1103/PhysRevB.91.195114
M3 - Article
AN - SCOPUS:84929578911
SN - 1098-0121
VL - 91
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 19
M1 - 195114
ER -