Important Roles of Te 5p and Ir 5d Spin–Orbit Interactions on the Multi-band Electronic Structure of Triangular Lattice Superconductor Ir1−xPtxTe2

• DOI: 10.7566/jpsj.83.033704
• Publication Date: 2014-02-17T01:00:40Z
• Authors: Daiki Ootsuki; Tatsuya Toriyama; Masakazu Kobayashi; Sunseng Pyon; Kazutaka Kudo; Minoru Nohara; Takuya Sugimoto; Teppei Yoshida; Masafumi Horio; Atsushi Fujimori; Masashi Arita; Hiroaki Anzai; Hirofumi Namatame; Masaki Taniguchi; Naurang L. Saini; Takehisa Konishi; Yukinori Ohta; Takashi Mizokawa
• Keywords: Superconductivity (cond-mat.supr-con); Condensed Matter - Superconductivity; 0103 physical sciences; FOS: Physical sciences; 01 natural sciences; 7. Clean energy; 3. Good health

We report an angle-resolved photoemission spectroscopy (ARPES) study on a triangular lattice superconductor Ir$_{1-x}$Pt$_{x}$Te$_2$ in which the Ir-Ir or Te-Te bond formation, the band Jahn-Teller effect, and the spin-orbit interaction are cooperating and competing with one another. The Fermi surfaces of the substituted system are qualitatively similar to the band structure calculations for the undistorted IrTe$_2$ with an upward chemical potential shift due to electron doping. A combination of the ARPES and the band structure calculations indicates that the Te $5p$ spin-orbit interaction removes the $p_x/p_y$ orbital degeneracy and induces $p_x \pm ip_y$ type spin-orbit coupling near the A point. The inner and outer Fermi surfaces are entangled by the Te $5p$ and Ir $5d$ spin-orbit interactions which may provide exotic superconductivity with singlet-triplet mixing.<br/>10 pages, 4 figures<br/>