TY - JOUR
T1 - Commensurate versus incommensurate charge ordering near the superconducting dome in Ir1-xPtxTe2 revealed by resonant x-ray scattering
AU - Takubo, K.
AU - Yamamoto, K.
AU - Hirata, Y.
AU - Wadati, H.
AU - Mizokawa, T.
AU - Sutarto, R.
AU - He, F.
AU - Ishii, K.
AU - Yamasaki, Y.
AU - Nakao, H.
AU - Murakami, Y.
AU - Matsuo, G.
AU - Ishii, H.
AU - Kobayashi, M.
AU - Kudo, K.
AU - Nohara, M.
N1 - Funding Information:
The authors thank D. Ootsuki for valuable discussions. We also acknowledge technical supports of K. Yajima (ISSP) for the sample characterization. REXS measurement at the Te edges in this paper was performed at the Canadian Light Source, which is supported by the Canada Foundation for Innovation, Natural Sciences and Engineering Research Council of Canada, the University of Saskatchewan, the Government of Saskatchewan, Western Economic Diversification Canada, the National Research Council Canada, and the Canadian Institutes of Health Research. REXS measurement at the Ir edge was performed under the approval of the Photon Factory Program Advisory Committee (Proposals No. 2015G556 and No. 2015S2-007) at the Institute of Material Structure Science, KEK. RIXS measurement at the Ir edge was performed at QST beamline BL11XU of SPring-8 with the approval of Nanotechnology Platform project supported by the Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) (Proposal No. A-16-QS-0003) and the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2016A3564). REXS measurement at the Te edge was performed at JAEA beamline BL22XU of SPring-8 under the Shared Use Program of JAEA Facilities (Proposal No. 2014B-E23) with the approval of Nanotechnology Platform project supported by MEXT (Proposal No. A-14-AE-0044) and JASRI (Proposal No. 2014B3787). This work was supported by the Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for Young Scientists (B) (No. 16K20997).
Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/5/31
Y1 - 2018/5/31
N2 - The electronic-structural modulations of Ir1-xPtxTe2 (0x0.12) have been examined by resonant elastic x-ray scattering (REXS) and resonant inelastic x-ray scattering (RIXS) techniques at both the Ir and Te edges. Charge-density-wave-like superstructures with wave vectors of Q=(1/50-1/5), (1/80-1/8), and (1/60-1/6) are observed on the same sample of IrTe2 at the lowest temperature, the patterns of which are controlled by the cooling speeds. In contrast, superstructures around Q=(1/50-1/5) are observed for doped samples (0.02x0.05). The superstructure reflections persist to higher Pt substitution than previously assumed, demonstrating that a charge-density wave (CDW) can coexist with superconductivity. The analysis of the energy-dependent REXS and RIXS line shape reveals the importance of the Te 5p state rather than the Ir 5d states in the formation of the spatial modulation of these systems. The phase diagram reexamined in this work suggests that the CDW incommensurability may correlate with the emergence of superconducting states such as CuxTiSe2 and LixTaS2.
AB - The electronic-structural modulations of Ir1-xPtxTe2 (0x0.12) have been examined by resonant elastic x-ray scattering (REXS) and resonant inelastic x-ray scattering (RIXS) techniques at both the Ir and Te edges. Charge-density-wave-like superstructures with wave vectors of Q=(1/50-1/5), (1/80-1/8), and (1/60-1/6) are observed on the same sample of IrTe2 at the lowest temperature, the patterns of which are controlled by the cooling speeds. In contrast, superstructures around Q=(1/50-1/5) are observed for doped samples (0.02x0.05). The superstructure reflections persist to higher Pt substitution than previously assumed, demonstrating that a charge-density wave (CDW) can coexist with superconductivity. The analysis of the energy-dependent REXS and RIXS line shape reveals the importance of the Te 5p state rather than the Ir 5d states in the formation of the spatial modulation of these systems. The phase diagram reexamined in this work suggests that the CDW incommensurability may correlate with the emergence of superconducting states such as CuxTiSe2 and LixTaS2.
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U2 - 10.1103/PhysRevB.97.205142
DO - 10.1103/PhysRevB.97.205142
M3 - Article
AN - SCOPUS:85048287492
VL - 97
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 2469-9950
IS - 20
M1 - 205142
ER -