We have studied the electronic structure of the triangular lattice Ir1-xPtxTe2 superconductor using photoemission spectroscopy and model calculations. Ir 4f core-level photoemission spectra show that Ir 5d t(2g) charge modulation established in the low-temperature phase of IrTe2 is suppressed by Pt doping. This observation indicates that the suppression of charge modulation is related to the emergence of superconductivity. Valence-band photoemission spectra of IrTe2 suggest that the Ir 5d charge modulation is accompanied by Ir 5d orbital reconstruction. Based on the photoemission results and model calculations, we argue that the orbitally induced Peierls effect governs the charge and orbital instability in Ir1-xPtxTe2.
Orbital degeneracy and Peierls instability in the triangular-lattice superconductor Ir_{1−x}Pt_{x}Te_{2} / Daiki, Ootsuki; Wakisaka, Yuki; Sunseng, Pyon; Kazutaka, Kudo; Minoru, Nohara; Masashi, Arita; Hiroaki, Anzai; Hirofumi, Namatame; Taniguchi, Masaki; Saini, Naurang Lal; Takashi, Mizokawa. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 86:1(2012), p. 014519. [10.1103/physrevb.86.014519]
Orbital degeneracy and Peierls instability in the triangular-lattice superconductor Ir_{1−x}Pt_{x}Te_{2}
SAINI, Naurang Lal;
2012
Abstract
We have studied the electronic structure of the triangular lattice Ir1-xPtxTe2 superconductor using photoemission spectroscopy and model calculations. Ir 4f core-level photoemission spectra show that Ir 5d t(2g) charge modulation established in the low-temperature phase of IrTe2 is suppressed by Pt doping. This observation indicates that the suppression of charge modulation is related to the emergence of superconductivity. Valence-band photoemission spectra of IrTe2 suggest that the Ir 5d charge modulation is accompanied by Ir 5d orbital reconstruction. Based on the photoemission results and model calculations, we argue that the orbitally induced Peierls effect governs the charge and orbital instability in Ir1-xPtxTe2.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
