Journal Article

PUBDB-2017-01684

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Structure Studies of the Bond-Orientational order and the hexatic-smectic transition in liquid crystals of various compositions

Zaluzhnyy, I. (Corresponding author) ; Kurta, R.XFEL.EU* ; Sulyanova, E.Extern* ; Gorobtsov, O.DESY* ; Shabalin, A.Extern* ; Zozulya, A.XFEL.EU* ; Menushenkov, A.Extern* ; Sprung, M.DESY* ; Kŕowczyński, A. ; Górecka, E. ; Ostrovskiy, B.Extern* ; Vartaniants, I.DESY*

2017
Royal Soc. of Chemistry London

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Please use a persistent id in citations: doi:10.1039/C7SM00343A  doi:10.3204/PUBDB-2017-01684

Abstract: We report on the X-ray studies of freely suspended hexatic films of three different liquid crystal compounds. By applying angular X-ray cross-correlation analysis (XCCA) to the measured diffraction patterns the parameters of the bond-orientational (BO) order in the hexatic phase were directly determined. The temperature evolution of the BO order parameters was analyzed on the basis of the multicritical scaling theory (MCST). Our results confirmed the validity of the MCST in the whole temperature range of the existence of the hexatic phase for all three compounds. The temperature dependence of the BO order parameters in the vicinity of the hexatic–smectic transition was fitted by a conventional power law with a critical exponent β ≈ 0.1 of extremely small value. We found that the temperature dependence of higher order harmonics of the BO order scales as the powers of the first harmonic, with an exponent equal to the harmonic number. This indicates a nonlinear coupling of the BO order parameters of different order. We demonstrate that compounds of various compositions, possessing different phase sequences at low temperatures, display the same thermodynamic behavior in the hexatic phase and in the vicinity of the smectic–hexatic phase transition.

Note: © The Royal Society of Chemistry

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Contributing Institute(s):

1. FS-Photon Science (FS-PS)
2. European XFEL Projekt Team (Eur.XFEL)
3. DOOR-User (DOOR)

Research Program(s):

1. 6215 - Soft Matter, Health and Life Sciences (POF3-621) (POF3-621)
2. 6G3 - PETRA III (POF3-622) (POF3-622)

Experiment(s):

1. PETRA Beamline P10 (PETRA III)

Appears in the scientific report 2017

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Database coverage:
; ; ; Allianz-Lizenz / DFG ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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