Publication detail

Phase coexistence and pinning of charge density waves by interfaces in chromium

SINGER, A. PATEL, S. UHLÍŘ, V. KUKREJA, R. ULVESTAD, A. DUFRESNE, E. SANDY, A. FULLERTON, E. SHPYRKO, O.

Czech title

Koexistence fází a zachytávání vln nábojové hustoty na rozhraních v chromu

English title

Phase coexistence and pinning of charge density waves by interfaces in chromium

Type

journal article in Web of Science

Language

en

Original abstract

We study the temperature dependence of the charge density wave (CDW) in a chromium thin film using x-ray diffraction. We exploit the interference between the CDW satellite peaks and Laue oscillations to determine the amplitude, the phase, and the period of the CDW. We find discrete half-integer periods of CDW in the film and switching of the number of periods by one upon cooling/heating with a thermal hysteresis of 20 K. The transition between different CDW periods occurs over a temperature range of 30 K, slightly larger than the width of the thermal hysteresis. A comparison with simulations shows that the phase transition occurs as a variation of the volume fraction of two distinct phases with well-defined periodicities. The phase of the CDW is constant for all temperatures, and we attribute it to strong pinning of the CDW by the mismatch-induced strain at the film-substrate interface.

Czech abstract

Článek pojednává o teplotní závislosti vln nábojové hustoty v tenkých vrstvách chromu studovaných pomocí rentgenové difrakce.

English abstract

We study the temperature dependence of the charge density wave (CDW) in a chromium thin film using x-ray diffraction. We exploit the interference between the CDW satellite peaks and Laue oscillations to determine the amplitude, the phase, and the period of the CDW. We find discrete half-integer periods of CDW in the film and switching of the number of periods by one upon cooling/heating with a thermal hysteresis of 20 K. The transition between different CDW periods occurs over a temperature range of 30 K, slightly larger than the width of the thermal hysteresis. A comparison with simulations shows that the phase transition occurs as a variation of the volume fraction of two distinct phases with well-defined periodicities. The phase of the CDW is constant for all temperatures, and we attribute it to strong pinning of the CDW by the mismatch-induced strain at the film-substrate interface.

Keywords in Czech

Vlny nábojové hustoty; Chrom; Fázová přeměna; Tenké vrstvy; Rentgenová difrakce

Keywords in English

Charge density waves; Chromium; Phase transition; Thin Films; X-ray diffraction

Released

16.11.2016

ISSN

1098-0121

Volume

94

Number

17

Pages from–to

174110-1–174110-5

Pages count

5

BIBTEX


@article{BUT133852,
  author="Andrej {Singer} and Sheena K. K. {Patel} and Vojtěch {Uhlíř} and Roopali {Kukreja} and Andrew {Ulvestad} and Eric {Dufresne} and Alec R. {Sandy} and E.E. {Fullerton} and Oleg {Shpyrko},
  title="Phase coexistence and pinning of charge density waves by interfaces in chromium",
  year="2016",
  volume="94",
  number="17",
  month="November",
  pages="174110-1--174110-5",
  issn="1098-0121"
}