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We have investigated the electronic structure of$\mathrm{Sr}_{1-y}\mathrm{Ca}_{y}\mathrm{Fe_{2}}(\mathrm{As}_{1-x}\mathrm{P}_{x}\mathrm{)_{2}}$($x$ = 0.25, $y$ = 0.08) by means of angle-resolved photoemission spectroscopy.From the comparison with the results of$\mathrm{BaFe_{2}}(\mathrm{As}_{1-x}\mathrm{P}_{x}\mathrm{)_{2}}$, the effectsof smaller structural anisotropy ($c/a$) on the Fermi surfaces (FSs) and thegap structures are discussed. The observed FSs have three dimensional shapes.One of the hole FSs is strongly warped between the $\Gamma$ and $Z$ points, andthe innermost FS observed at the $Z$ point disappears at the $\Gamma$ point,which is similar to the FS features of$\mathrm{SrFe_{2}}(\mathrm{As}_{1-x}\mathrm{P}_{x}\mathrm{)_{2}}$ ($x$ = 0.35).In the superconducting state, the node like gap-minimum is present for the$d_{xy}$ electron FS near the $X$ point, while the gaps around the other highsymmetry points are isotropic. Several theoretical models based on the spinand/or the orbital fluctuation are examined to explain all these experimentalresults.

journal of the physical society of japan

Electronic Structure of  $\mathrm{Sr}_{1-y}\mathrm{Ca}_{y}\mathrm{Fe_{2}}(\mathrm{As}_{1-x}\mathrm{P}_{x}\mathrm{)_{2}}$  ($x$ = 0.25, $y$ = 0.08) Revealed by Angle-Resolved Photoemission  Spectroscopy