Publication detail

Condensation of collective charge ordering in chromium

SINGER, A. MARSH, M. DIETZE, S. UHLÍŘ, V. LI, Y. WALKO, D. DUFRESNE, E. SRAJER, G. COSGRIFF, M. EVANS, P. SHPYRKO, O.

Czech title

Kondenzace kolektivního uspořádání náboje v chromu

English title

Condensation of collective charge ordering in chromium

Type

journal article in Web of Science

Language

en

Original abstract

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.

Czech abstract

Článek pojednává o dynamice parametrů strukturního uspořádání v chromu za pomoci synchrotronového záření.

English abstract

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.

Keywords in Czech

Vlny hustoty; Vlny napětí; Supravodivost; Vrstvy

Keywords in English

Density-wave; Strain wave; Superconductivity; Films

RIV year

2015

Released

19.03.2015

ISSN

1098-0121

Volume

91

Number

11

Pages from–to

115134-1–115134-8

Pages count

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"
}