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  Phase fluctuations and the absence of topological defects in a photo-excited charge-ordered nickelate

Lee, W. S., Chuang, Y. D., Moore, R. G., Zhu, Y., Patthey, L., Trigo, M., et al. (2012). Phase fluctuations and the absence of topological defects in a photo-excited charge-ordered nickelate. Nature Communications, 3: 838. doi:10.1038/ncomms1837.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-1517-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-0991-B
Genre: Journal Article

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http://dx.doi.org/10.1038/ncomms1837 (Publisher version)
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http://arxiv.org/abs/1205.5609 (Postprint)
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 Creators:
Lee, W. S.1, Author
Chuang, Y. D.2, Author
Moore, R. G.1, Author
Zhu, Y.3, Author
Patthey, L.1, 4, Author
Trigo, M.1, 5, Author
Lu, D. H.6, Author
Kirchmann, P. S.1, Author
Krupin, O.7, 8, Author
Yi, M.1, Author
Langner, M.3, Author
Huse, Nils3, 9, Author              
Robinson, J. S.3, Author
Chen, Y.1, Author
Zhou, S. Y.2, 3, Author
Coslovich, G.3, Author
Huber, B.3, Author
Reis, D. A.1, 5, Author
Kaindl, R. A.3, Author
Schoenlein, R. W.2, 3, Author
Doering, D.10, AuthorDenes, P.10, AuthorSchlotter, W. F.8, AuthorTurner, J. J.8, AuthorJohnson, S. L.4, AuthorFörst, Michael11, Author              Sasagawa, T.12, AuthorKung, Y. F.1, AuthorSorini, A. P.1, AuthorKemper, A. F.1, AuthorMoritz, B.1, AuthorDevereaux, T. P.1, AuthorLee, D.-H.13, AuthorShen, Z. X.1, AuthorHussain, Z.2, Author more..
Affiliations:
1Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, California 94025, USA, ou_persistent22              
2Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA, ou_persistent22              
3Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA, ou_persistent22              
4Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen-PSI, Switzerland, ou_persistent22              
5Stanford PULSE Institute for Ultrafast Energy Science, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA, ou_persistent22              
6Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA, ou_persistent22              
7European XFEL, Hamburg, Germany, ou_persistent22              
8Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA, ou_persistent22              
9Ultrafast Molecular Dynamics, Research Groups, Max Planck Research Department for Structural Dynamics, Department of Physics, University of Hamburg, External Organizations, ou_2173640              
10Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA, ou_persistent22              
11Condensed Matter Dynamics Division, Max Planck Research Department for Structural Dynamics, Department of Physics, University of Hamburg, External Organizations, ou_2173637              
12Materials and Structures Laboratory, Tokyo Institute of Technology, Kanagawa 226-8503, Japan, ou_persistent22              
13Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA, ou_persistent22              

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Free keywords: Physical sciences; Condensed matter; Materials science
 Abstract: The dynamics of an order parameter's amplitude and phase determines the collective behaviour of novel states emerging in complex materials. Time- and momentum-resolved pump-probe spectroscopy, by virtue of measuring material properties at atomic and electronic time scales out of equilibrium, can decouple entangled degrees of freedom by visualizing their corresponding dynamics in the time domain. Here we combine time-resolved femotosecond optical and resonant X-ray diffraction measurements on charge ordered La1.75Sr0.25NiO4 to reveal unforeseen photoinduced phase fluctuations of the charge order parameter. Such fluctuations preserve long-range order without creating topological defects, distinct from thermal phase fluctuations near the critical temperature in equilibrium. Importantly, relaxation of the phase fluctuations is found to be an order of magnitude slower than that of the order parameter's amplitude fluctuations, and thus limits charge order recovery. This new aspect of phase fluctuations provides a more holistic view of the phase's importance in ordering phenomena of quantum matter.

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Language(s): eng - English
 Dates: 2012-01-132012-04-112012-05-15
 Publication Status: Published online
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/ncomms1837
arXiv: 1205.5609
 Degree: -

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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 3 Sequence Number: 838 Start / End Page: - Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723