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We report a structural transition found in Ca10(Ir4As8)(Fe2-xIrxAs2)5, whichexhibits superconductivity at 16 K. The c-axis parameter is doubled below astructural transition temperature of approximately 100 K, while the tetragonalsymmetry with space group P4/n (No.85) is unchanged at all temperaturesmeasured. Our synchrotron x-ray diffraction study clearly shows iridium ions ata non-coplanar position shift along the z-direction at the structural phasetransition. We discuss that the iridium displacements affect superconductivityin Fe2As2 layers.

Synchrotron X-ray Diffraction Study of Structural Phase Transition in Ca10(Ir4As8)(Fe2-xIrxAs2)