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X-ray imaging of dispersive charge modes in a doped Mott insulator near the antiferromagnet/superconductor transition

Li, Y. W. and Qian, D. and Wray, L. and Hsieh, D. and Xia, Y. and Kaga, Y. and Sasagawa, T. and Takagi, H. and Markiewicz, R. S. and Bansil, A. and Eisaki, H. and Uchida, S. and Hasan, M. Z. (2008) X-ray imaging of dispersive charge modes in a doped Mott insulator near the antiferromagnet/superconductor transition. Physical Review B, 78 (7). Art. No. 073104. ISSN 1098-0121. doi:10.1103/PhysRevB.78.073104.

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Momentum-resolved inelastic resonant x-ray scattering is used to map the doping evolution of bulk electronic modes in the doped Mott insulator class Nd_(2−x)Ce_xCuO_4. As the doping induced antiferromagnet/superconductor (AFM/SC) transition is approached, we observe an anisotropic redistribution of the spectral weight of collective excitations over a large energy scale along the Γ→(π,π) direction, whereas the modes exhibit broadening (∼1 eV) with relatively little softening along Γ→(π,0) with respect to the parent Mott state (x=0). Our study reveals a closing of the charge gap in the vicinity of the zone center even though the mode softening and spectral redistribution involve an unusually large energy scale over the full Brillouin zone. The collective behavior of modes in the vicinity of the AFM/SC critical transition is demonstrated.

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Hsieh, D.0000-0002-0812-955X
Additional Information:© 2008 The American Physical Society. Received 8 January 2008. Published 15 August 2008. We gratefully acknowledge P. W. Anderson, N. P. Ong, and T. Tohyama for discussions and T. Gog and D. Casa for beamline support. This work is primarily supported by DOE/ BES Grant No. DE-FG-02–05ER46200. The work at NEU is supported by the U.S. Department of Energy Contract Nos. DE-FG02–07ER46352 and No. DE-AC03–76SF00098, and benefitted from the allocation of supercomputer time at NERSC and Northeastern University’s Advanced Scientific Computation Center. The use of APS is supported by DOE W-31–10-Eng-38.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG-02–05ER46200
Department of Energy (DOE)DE-FG02–07ER46352
Department of Energy (DOE)DE-AC03–76SF00098
Department of Energy (DOE)W-31–10-Eng-38
Issue or Number:7
Classification Code:PACS numbers: 78.70.Ck, 74.20.Mn, 74.25.Jb, 74.72.h
Record Number:CaltechAUTHORS:20140908-095501791
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49326
Deposited By: Joy Painter
Deposited On:08 Sep 2014 17:27
Last Modified:10 Nov 2021 18:42

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