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

Nature Communications
W S LeeZ Hussain

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 La(1.75)Sr(0.25)NiO(4) 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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Citations

Mar 19, 2014·Nature Communications·S AnissimovaD Reznik
Jan 21, 2014·The Journal of Chemical Physics·T Elsaesser, M Woerner
Jan 23, 2016·Structural Dynamics·Maria EkimovaErik T J Nibbering
Dec 5, 2017·Science Advances·Giacomo CoslovichRobert A Kaindl
Oct 25, 2013·Nature Communications·G CoslovichR A Kaindl
Jul 31, 2013·Nature Materials·S de JongH A Dürr
Sep 2, 2014·Journal of Synchrotron Radiation·Karsten HolldackAlexander Föhlisch
Oct 23, 2018·Science Advances·Alfred ZongNuh Gedik
Nov 18, 2015·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Yuelin LiJ F Mitchell
Mar 12, 2016·Physical Review Letters·Y WangT P Devereaux
May 13, 2017·Physical Review Letters·Ruidan ZhongJ M Tranquada
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Sep 3, 2020·The Review of Scientific Instruments·Hoyoung JangSeungyu Rah
May 2, 2015·Journal of Synchrotron Radiation·Joshua J TurnerMichael Holmes
Jan 30, 2018·Structural Dynamics·Rafael AbelaLuc Patthey
May 2, 2015·Journal of Synchrotron Radiation·Gabriel BlajMatt Weaver
Mar 18, 2021·Nature Communications·Hope M BretscherAkshay Rao
Apr 12, 2013·Physical Review Letters·T MerteljD Mihailovic

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