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Title: Dispersive charge density wave excitations in Bi 2Sr 2CaCu 2O 8+δ [Dispersive charge density wave excitations and temperature dependent commensuration in Bi 2Sr 2CaCu 2O 8+δ]

Abstract

Experimental evidence on high-T c cuprates reveals ubiquitous charge density wave (CDW) modulations, which coexist with superconductivity. Although the CDW had been predicted by theory, important questions remain about the extent to which the CDW influences lattice and charge degrees of freedom and its characteristics as functions of doping and temperature. These questions are intimately connected to the origin of the CDW and its relation to the mysterious cuprate pseudogap. We use ultrahigh-resolution resonant inelastic X-ray scattering to reveal new CDW character in underdoped Bi 2.2Sr 1.8Ca 0.8Dy 0.2Cu 2O 8+δ. At low temperature, we observe dispersive excitations from an incommensurate CDW that induces anomalously enhanced phonon intensity, unseen using other techniques. Furthermore, near the pseudogap temperature T*, the CDW persists, but the associated excitations significantly weaken with an indication of CDW wavevector shift. The dispersive CDW excitations, phonon anomaly, and analysis of the CDW wavevector provide a comprehensive momentum-space picture of complex CDW behaviour and point to a closer relationship with the pseudogap state.

Authors:
 [1]; ORCiD logo [2];  [3];  [4];  [1];  [5];  [5];  [6];  [6];  [7];  [7];  [7]; ORCiD logo [8];  [2];  [9];  [9];  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences
  2. Polytechnic Univ. of Milan (Italy). Dept. of Physics, National Research Council-SPIN Inst. (CNR-SPIN)
  3. Polytechnic Univ. of Milan (Italy). Dept. of Physics
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource
  5. European Synchrotron Radiation Facility (ESRF), Grenoble (France)
  6. Stanford Univ., CA (United States). Geballe Lab. for Advancved Materials
  7. National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan)
  8. National Research Council-SPIN Inst. (CNR-SPIN), Napoli (Italy)
  9. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences; Stanford Univ., CA (United States). Geballe Lab. for Advancved Materials
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1407695
Alternate Identifier(s):
OSTI ID: 1418320
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Nature Physics
Additional Journal Information:
Journal Volume: 13; Journal Issue: 10; Journal ID: ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; characterization and analytical techniques; phase transitions and critical phenomena; superconducting properties and materials

Citation Formats

Chaix, L., Ghiringhelli, G., Peng, Y. Y., Hashimoto, M., Moritz, B., Kummer, K., Brookes, N. B., He, Y., Chen, S., Ishida, S., Yoshida, Y., Eisaki, H., Salluzzo, M., Braicovich, L., Shen, Z. -X., Devereaux, T. P., and Lee, W. -S. Dispersive charge density wave excitations in Bi2Sr2CaCu2O8+δ [Dispersive charge density wave excitations and temperature dependent commensuration in Bi2Sr2CaCu2O8+δ]. United States: N. p., 2017. Web. doi:10.1038/nphys4157.
Chaix, L., Ghiringhelli, G., Peng, Y. Y., Hashimoto, M., Moritz, B., Kummer, K., Brookes, N. B., He, Y., Chen, S., Ishida, S., Yoshida, Y., Eisaki, H., Salluzzo, M., Braicovich, L., Shen, Z. -X., Devereaux, T. P., & Lee, W. -S. Dispersive charge density wave excitations in Bi2Sr2CaCu2O8+δ [Dispersive charge density wave excitations and temperature dependent commensuration in Bi2Sr2CaCu2O8+δ]. United States. doi:10.1038/nphys4157.
Chaix, L., Ghiringhelli, G., Peng, Y. Y., Hashimoto, M., Moritz, B., Kummer, K., Brookes, N. B., He, Y., Chen, S., Ishida, S., Yoshida, Y., Eisaki, H., Salluzzo, M., Braicovich, L., Shen, Z. -X., Devereaux, T. P., and Lee, W. -S. Mon . "Dispersive charge density wave excitations in Bi2Sr2CaCu2O8+δ [Dispersive charge density wave excitations and temperature dependent commensuration in Bi2Sr2CaCu2O8+δ]". United States. doi:10.1038/nphys4157. https://www.osti.gov/servlets/purl/1407695.
@article{osti_1407695,
title = {Dispersive charge density wave excitations in Bi2Sr2CaCu2O8+δ [Dispersive charge density wave excitations and temperature dependent commensuration in Bi2Sr2CaCu2O8+δ]},
author = {Chaix, L. and Ghiringhelli, G. and Peng, Y. Y. and Hashimoto, M. and Moritz, B. and Kummer, K. and Brookes, N. B. and He, Y. and Chen, S. and Ishida, S. and Yoshida, Y. and Eisaki, H. and Salluzzo, M. and Braicovich, L. and Shen, Z. -X. and Devereaux, T. P. and Lee, W. -S.},
abstractNote = {Experimental evidence on high-Tc cuprates reveals ubiquitous charge density wave (CDW) modulations, which coexist with superconductivity. Although the CDW had been predicted by theory, important questions remain about the extent to which the CDW influences lattice and charge degrees of freedom and its characteristics as functions of doping and temperature. These questions are intimately connected to the origin of the CDW and its relation to the mysterious cuprate pseudogap. We use ultrahigh-resolution resonant inelastic X-ray scattering to reveal new CDW character in underdoped Bi2.2Sr1.8Ca0.8Dy0.2Cu2O8+δ. At low temperature, we observe dispersive excitations from an incommensurate CDW that induces anomalously enhanced phonon intensity, unseen using other techniques. Furthermore, near the pseudogap temperature T*, the CDW persists, but the associated excitations significantly weaken with an indication of CDW wavevector shift. The dispersive CDW excitations, phonon anomaly, and analysis of the CDW wavevector provide a comprehensive momentum-space picture of complex CDW behaviour and point to a closer relationship with the pseudogap state.},
doi = {10.1038/nphys4157},
journal = {Nature Physics},
number = 10,
volume = 13,
place = {United States},
year = {2017},
month = {6}
}

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Cited by: 15 works
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Figures / Tables:

Figure 1 Figure 1: RIXS process and a hint of lower energy excitations near QCDW. a, Schematics of the coherent two-step RIXS process. The photon energy of the incident xray (hui) is tuned to the Cu L3-edge. Upon absorption, a core electron in the Cu 2p orbital made a transition to themore » unoccupied 3d valence band near the Fermi energy EF, bringing the system to an intermediate state |m$\rangle$. Then, the emission process occurs that fills the 2p core hole by one of the valence electrons, emits an photon (hυf), and leaves the system in an excited final state |f$\rangle$, which couple to a variety of elementary excitations. The energy-momentum information of these elementary excitations can be deduced by tracking the peak and spectral weight in RIXS spectra as a function of the momentum transfer Q and the energy loss of the scattering photons. ki and kf represent the momentum of the incident and scattered photons, respectively. Since the electronic state in Bi2212 is quasi-two-directional, i.e. rather independent along the c-axis, all data are plotted as a function of projected momentum transfer Q// along [100] direction, i.e. along the Cu-O bond direction. b, RIXS intensity map of the underdoped Nd1.2Ba1.8Cu3O6+δ (UD-NBCO) compound around the CDW position, taken with a resolution of 130 meV. The red dashed line indicates the RIXS spectrum shown in c. c, Comparison of two RIXS spectra recorded with the low (UD-NBCO, ∆E ~ 130 meV) and high-energy resolution (UD-Bi2212, ∆E ~ 40 meV) at Q// = 0.31 r.l.u..« less

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    • Nature Physics, Vol. 1, Issue 3
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