Detail publikace
Kondenzace kolektivního uspořádání náboje v chromu
SINGER, A. MARSH, M. DIETZE, S. UHLÍŘ, V. LI, Y. WALKO, D. DUFRESNE, E. SRAJER, G. COSGRIFF, M. EVANS, P. SHPYRKO, O.
Český název
Kondenzace kolektivního uspořádání náboje v chromu
Anglický název
Condensation of collective charge ordering in chromium
Typ
článek v časopise ve Web of Science, Jimp
Jazyk
en
Originální abstrakt
We report on the dynamics of the structural order parameter in a chromium film using synchrotron radiation in response to photoinduced ultrafast excitations. Following transient optical excitations the effective lattice temperature of the film rises close to the Néel temperature and the charge-density wave (CDW) amplitude is reduced but does not appear to ever be fully destroyed. The persistence of the CDW diffraction signal demonstrates that the CDW, if destroyed by the laser pulse, must be reestablished within the 100-ps time resolution of the synchrotron x-ray pulses. Furthermore, at all times after photoexcitation, the CDW retains its low-temperature periodicity, rather than regenerating with its high-temperature period shortly after photoexcitation. The long-term evolution shows that the CDW reverts to its ground state on a time scale of 370+-40 ps. We attribute the apparent persistence of the CDW to the long-lived periodic lattice displacement in chromium. This study highlights the fundamental role of the lattice distortion and its impact on the recondensation dynamics of the charge ordered state in strongly correlated materials.
Český abstrakt
Článek pojednává o dynamice parametrů strukturního uspořádání v chromu za pomoci synchrotronového záření.
Anglický abstrakt
We report on the dynamics of the structural order parameter in a chromium film using synchrotron radiation in response to photoinduced ultrafast excitations. Following transient optical excitations the effective lattice temperature of the film rises close to the Néel temperature and the charge-density wave (CDW) amplitude is reduced but does not appear to ever be fully destroyed. The persistence of the CDW diffraction signal demonstrates that the CDW, if destroyed by the laser pulse, must be reestablished within the 100-ps time resolution of the synchrotron x-ray pulses. Furthermore, at all times after photoexcitation, the CDW retains its low-temperature periodicity, rather than regenerating with its high-temperature period shortly after photoexcitation. The long-term evolution shows that the CDW reverts to its ground state on a time scale of 370+-40 ps. We attribute the apparent persistence of the CDW to the long-lived periodic lattice displacement in chromium. This study highlights the fundamental role of the lattice distortion and its impact on the recondensation dynamics of the charge ordered state in strongly correlated materials.
Klíčová slova česky
Vlny hustoty; Vlny napětí; Supravodivost; Vrstvy
Klíčová slova anglicky
Density-wave; Strain wave; Superconductivity; Films
Rok RIV
2015
Vydáno
19.03.2015
ISSN
1098-0121
Ročník
91
Číslo
11
Strany od–do
115134-1–115134-8
Počet stran
8
BIBTEX
@article{BUT133739,
author="Andrej {Singer} and Moses {Marsh} and Sebastian {Dietze} and Vojtěch {Uhlíř} and Yuelin {Li} and Donald {Walko} and Eric {Dufresne} and George {Srajer} and Margaret {Cosgriff} and Paul {Evans} and Oleg {Shpyrko},
title="Condensation of collective charge ordering in chromium",
year="2015",
volume="91",
number="11",
month="March",
pages="115134-1--115134-8",
issn="1098-0121"
}