Ultrafast charge localization in a stripe-phase nickelate

G. Coslovich; B. Huber; W. S. Lee; Y. D. Chuang; Y. Zhu; T. Sasagawa; Z. Hussain; H. A. Bechtel; M. C. Martin; Z. X. Shen; R. W. Schoenlein; R. A. Kaindl

doi:10.1038/ncomms3643

Ultrafast charge localization in a stripe-phase nickelate

G. Coslovich, B. Huber, W. S. Lee, Y. D. Chuang, Y. Zhu, T. Sasagawa, Z. Hussain, H. A. Bechtel, M. C. Martin, Z. X. Shen, R. W. Schoenlein, R. A. Kaindl

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

Self-organized electronically ordered phases are a recurring feature in correlated materials, resulting in, for example, fluctuating charge stripes whose role in high-T C superconductivity is under debate. However, the relevant cause-effect relations between real-space charge correlations and low-energy excitations remain hidden in time-averaged studies. Here we reveal ultrafast charge localization and lattice vibrational coupling as dynamic precursors of stripe formation in the model compound La 1.75 Sr 0.25 NiO 4, using ultrafast and equilibrium mid-infrared spectroscopy. The opening of a pseudogap at a crossover temperature T * far above long-range stripe formation establishes the onset of electronic localization, which is accompanied by an enhanced Fano asymmetry of Ni-O stretch vibrations. Ultrafast excitation triggers a sub-picosecond dynamics exposing the synchronous modulation of electron-phonon coupling and charge localization. These results illuminate the role of localization in forming the pseudogap in nickelates, opening a path to understanding this mysterious phase in a broad class of complex oxides.

Original language	English (US)
Article number	2643
Journal	Nature communications
Volume	4
DOIs	https://doi.org/10.1038/ncomms3643
State	Published - 2013
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Biochemistry, Genetics and Molecular Biology(all)
Physics and Astronomy(all)

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10.1038/ncomms3643

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@article{6627c96a344f46e3b2ef194b8ed4cd30,

title = "Ultrafast charge localization in a stripe-phase nickelate",

abstract = "Self-organized electronically ordered phases are a recurring feature in correlated materials, resulting in, for example, fluctuating charge stripes whose role in high-T C superconductivity is under debate. However, the relevant cause-effect relations between real-space charge correlations and low-energy excitations remain hidden in time-averaged studies. Here we reveal ultrafast charge localization and lattice vibrational coupling as dynamic precursors of stripe formation in the model compound La 1.75 Sr 0.25 NiO 4, using ultrafast and equilibrium mid-infrared spectroscopy. The opening of a pseudogap at a crossover temperature T * far above long-range stripe formation establishes the onset of electronic localization, which is accompanied by an enhanced Fano asymmetry of Ni-O stretch vibrations. Ultrafast excitation triggers a sub-picosecond dynamics exposing the synchronous modulation of electron-phonon coupling and charge localization. These results illuminate the role of localization in forming the pseudogap in nickelates, opening a path to understanding this mysterious phase in a broad class of complex oxides.",

author = "G. Coslovich and B. Huber and Lee, {W. S.} and Chuang, {Y. D.} and Y. Zhu and T. Sasagawa and Z. Hussain and Bechtel, {H. A.} and Martin, {M. C.} and Shen, {Z. X.} and Schoenlein, {R. W.} and Kaindl, {R. A.}",

note = "Funding Information: We thank T. Deveraux, M. Schir{\`o} and G. Sawatzky for their interesting discussions. This research was supported by the US Department of Energy, Office of Basic Energy Sciences (DOE BES), Division of Materials Sciences and Engineering under contract DE-AC02-05CH11231 at Lawrence Berkeley National Laboratory in the Ultrafast Materials Science program (G.C., B.H., Y.Z., R.W.S. and R.A.K.). The Advanced Light Source Division is supported by DOE BES under the same contract (Y.-D.C., H.B., M.C.M. and Z.H.). W.-S.L. and Z.-X.S. acknowledge the funding from the Division of Materials Sciences and Engineering, DOE BES under contract DE-AC02-76SF00515 at SLAC National Accelerator Laboratory and Stanford Institute for Materials and Energy Sciences. B.H. acknowledges fellowship support from the German Academic Exchange Service (DAAD) and participation in an exchange program with the U.C. Berkeley Nanosciences and Nanoengineering Institute.",

year = "2013",

doi = "10.1038/ncomms3643",

language = "English (US)",

volume = "4",

journal = "Nature Communications",

issn = "2041-1723",

publisher = "Nature Publishing Group",

}

TY - JOUR

T1 - Ultrafast charge localization in a stripe-phase nickelate

AU - Coslovich, G.

AU - Huber, B.

AU - Lee, W. S.

AU - Chuang, Y. D.

AU - Zhu, Y.

AU - Sasagawa, T.

AU - Hussain, Z.

AU - Bechtel, H. A.

AU - Martin, M. C.

AU - Shen, Z. X.

AU - Schoenlein, R. W.

AU - Kaindl, R. A.

N1 - Funding Information: We thank T. Deveraux, M. Schirò and G. Sawatzky for their interesting discussions. This research was supported by the US Department of Energy, Office of Basic Energy Sciences (DOE BES), Division of Materials Sciences and Engineering under contract DE-AC02-05CH11231 at Lawrence Berkeley National Laboratory in the Ultrafast Materials Science program (G.C., B.H., Y.Z., R.W.S. and R.A.K.). The Advanced Light Source Division is supported by DOE BES under the same contract (Y.-D.C., H.B., M.C.M. and Z.H.). W.-S.L. and Z.-X.S. acknowledge the funding from the Division of Materials Sciences and Engineering, DOE BES under contract DE-AC02-76SF00515 at SLAC National Accelerator Laboratory and Stanford Institute for Materials and Energy Sciences. B.H. acknowledges fellowship support from the German Academic Exchange Service (DAAD) and participation in an exchange program with the U.C. Berkeley Nanosciences and Nanoengineering Institute.

PY - 2013

Y1 - 2013

N2 - Self-organized electronically ordered phases are a recurring feature in correlated materials, resulting in, for example, fluctuating charge stripes whose role in high-T C superconductivity is under debate. However, the relevant cause-effect relations between real-space charge correlations and low-energy excitations remain hidden in time-averaged studies. Here we reveal ultrafast charge localization and lattice vibrational coupling as dynamic precursors of stripe formation in the model compound La 1.75 Sr 0.25 NiO 4, using ultrafast and equilibrium mid-infrared spectroscopy. The opening of a pseudogap at a crossover temperature T * far above long-range stripe formation establishes the onset of electronic localization, which is accompanied by an enhanced Fano asymmetry of Ni-O stretch vibrations. Ultrafast excitation triggers a sub-picosecond dynamics exposing the synchronous modulation of electron-phonon coupling and charge localization. These results illuminate the role of localization in forming the pseudogap in nickelates, opening a path to understanding this mysterious phase in a broad class of complex oxides.

AB - Self-organized electronically ordered phases are a recurring feature in correlated materials, resulting in, for example, fluctuating charge stripes whose role in high-T C superconductivity is under debate. However, the relevant cause-effect relations between real-space charge correlations and low-energy excitations remain hidden in time-averaged studies. Here we reveal ultrafast charge localization and lattice vibrational coupling as dynamic precursors of stripe formation in the model compound La 1.75 Sr 0.25 NiO 4, using ultrafast and equilibrium mid-infrared spectroscopy. The opening of a pseudogap at a crossover temperature T * far above long-range stripe formation establishes the onset of electronic localization, which is accompanied by an enhanced Fano asymmetry of Ni-O stretch vibrations. Ultrafast excitation triggers a sub-picosecond dynamics exposing the synchronous modulation of electron-phonon coupling and charge localization. These results illuminate the role of localization in forming the pseudogap in nickelates, opening a path to understanding this mysterious phase in a broad class of complex oxides.

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U2 - 10.1038/ncomms3643

DO - 10.1038/ncomms3643

M3 - Article

C2 - 24153394

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SN - 2041-1723

VL - 4

JO - Nature Communications

JF - Nature Communications

M1 - 2643

ER -

Ultrafast charge localization in a stripe-phase nickelate

Abstract

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