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

D. Ootsuki; T. Toriyama; M. Kobayashi; S. Pyon; K. Kudo; M. Nohara; T. Sugimoto; T. Yoshida; M. Horio; A. Fujimori; M. Arita; H. Anzai; H. Namatame; M. Taniguchi; N. L. Saini; T. Konishi; Y. Ohta; T. Mizokawa

doi:10.7566/jpsj.83.033704

arXiv · 1311.1199

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

D. Ootsuki·T. Toriyama·M. Kobayashi·S. Pyon·K. Kudo·M. Nohara·T. Sugimoto·T. Yoshida·M. Horio·A. Fujimori·M. Arita·H. Anzai·H. Namatame·M. Taniguchi·N. L. Saini·T. Konishi·Y. Ohta·T. Mizokawa

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Abstract

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.

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D. Ootsuki, T. Toriyama, M. Kobayashi, S. Pyon, K. Kudo, M. Nohara, T. Sugimoto, T. Yoshida, M. Horio, A. Fujimori, M. Arita, H. Anzai, H. Namatame, M. Taniguchi, N. L. Saini, T. Konishi, Y. Ohta, T. Mizokawa. 2014-02-17. Important Roles of Te 5p and Ir 5d Spin-orbit Interactions on the Multi-band Electronic Structure of Triangular Lattice Superconductor Ir1-xPtxTe2. https://doi.org/10.7566/jpsj.83.033704

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