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

Naoyuki Katayama; Kento Sugawara; Yuki Sugiyama; Takafumi Higuchi; Kazutaka Kudo; Daisuke Mitsuoka; Takashi Mizokawa; Minoru Nohara; Hiroshi Sawa

doi:10.7566/JPSJ.83.113707

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

Superconductivity 2014-10-24 v1

Authors: Naoyuki Katayama , Kento Sugawara , Yuki Sugiyama , Takafumi Higuchi , Kazutaka Kudo , Daisuke Mitsuoka , Takashi Mizokawa , Minoru Nohara , Hiroshi Sawa

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Abstract

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

Keywords

structural phase transition superconductivity synchrotron X-ray diffraction Ca10(Ir4As8)(Fe2-xIrxAs2)5 iridium displacement

Cite

@article{arxiv.1410.6237,
  title  = {Synchrotron X-ray Diffraction Study of Structural Phase Transition in Ca10(Ir4As8)(Fe2-xIrxAs2)},
  author = {Naoyuki Katayama and Kento Sugawara and Yuki Sugiyama and Takafumi Higuchi and Kazutaka Kudo and Daisuke Mitsuoka and Takashi Mizokawa and Minoru Nohara and Hiroshi Sawa},
  journal= {arXiv preprint arXiv:1410.6237},
  year   = {2014}
}

Comments

12 pages, 3 figures. arXiv admin note: substantial text overlap with arXiv:1402.3889

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

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