Twist-bend nematic liquid crystals in high magnetic fields

P. K. Challa*, V. Borshch, O. Parri, C. T. Imrie, S. N. Sprunt, J. T. Gleeson, O. D. Lavrentovich, A. Jakli

*Corresponding author for this work

Research output: Contribution to journalArticle

65 Citations (Scopus)

Abstract

We present magneto-optic measurements on two materials that form the recently discovered twist-bend nematic (N-tb) phase. This intriguing state of matter represents a fluid phase that is orientationally anisotropic in three directions and also exhibits translational order with periodicity several times larger than the molecular size. N-tb materials may also spontaneously form a visible, macroscopic stripe texture. We show that the optical stripe texture can be persistently inhibited by a magnetic field, and a 25T external magnetic field depresses the N-N-tb phase transition temperature by almost 1 degrees C. We propose a quantitative mechanism to account for this shift and suggest a Helfrich-Hurault-type mechanism for the optical stripe formation.

Original languageEnglish
Article number060501
Number of pages5
JournalPhysical Review. E, Statistical, Nonlinear and Soft Matter Physics
Volume89
Issue number6
DOIs
Publication statusPublished - 6 Jun 2014

Keywords

  • BANANA-SHAPED MOLECULES
  • ORIENTATIONAL ORDER
  • PHASE
  • DIMERS
  • INSTABILITY
  • CHEVRON

Cite this

Twist-bend nematic liquid crystals in high magnetic fields. / Challa, P. K.; Borshch, V.; Parri, O.; Imrie, C. T.; Sprunt, S. N.; Gleeson, J. T.; Lavrentovich, O. D.; Jakli, A.

In: Physical Review. E, Statistical, Nonlinear and Soft Matter Physics, Vol. 89, No. 6, 060501, 06.06.2014.

Research output: Contribution to journalArticle

Challa, PK, Borshch, V, Parri, O, Imrie, CT, Sprunt, SN, Gleeson, JT, Lavrentovich, OD & Jakli, A 2014, 'Twist-bend nematic liquid crystals in high magnetic fields', Physical Review. E, Statistical, Nonlinear and Soft Matter Physics, vol. 89, no. 6, 060501. https://doi.org/10.1103/PhysRevE.89.060501
Challa, P. K. ; Borshch, V. ; Parri, O. ; Imrie, C. T. ; Sprunt, S. N. ; Gleeson, J. T. ; Lavrentovich, O. D. ; Jakli, A. / Twist-bend nematic liquid crystals in high magnetic fields. In: Physical Review. E, Statistical, Nonlinear and Soft Matter Physics. 2014 ; Vol. 89, No. 6.
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abstract = "We present magneto-optic measurements on two materials that form the recently discovered twist-bend nematic (N-tb) phase. This intriguing state of matter represents a fluid phase that is orientationally anisotropic in three directions and also exhibits translational order with periodicity several times larger than the molecular size. N-tb materials may also spontaneously form a visible, macroscopic stripe texture. We show that the optical stripe texture can be persistently inhibited by a magnetic field, and a 25T external magnetic field depresses the N-N-tb phase transition temperature by almost 1 degrees C. We propose a quantitative mechanism to account for this shift and suggest a Helfrich-Hurault-type mechanism for the optical stripe formation.",
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AU - Challa, P. K.

AU - Borshch, V.

AU - Parri, O.

AU - Imrie, C. T.

AU - Sprunt, S. N.

AU - Gleeson, J. T.

AU - Lavrentovich, O. D.

AU - Jakli, A.

N1 - This work was supported by the NSF under Grants No. DMR-0964765, No. DMR-1104805, No. DMR-1121288, and No. DMR-1307674, as well as DOE Grant No. DE-FG02-06ER 46331. Invaluable assistance was provided by W. Aldhizer and S. W. McGill. Work performed at NHMFL was supported by NSF cooperative agreement DMR-0084173, the State of Florida, and the U.S. Department of Energy.

PY - 2014/6/6

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N2 - We present magneto-optic measurements on two materials that form the recently discovered twist-bend nematic (N-tb) phase. This intriguing state of matter represents a fluid phase that is orientationally anisotropic in three directions and also exhibits translational order with periodicity several times larger than the molecular size. N-tb materials may also spontaneously form a visible, macroscopic stripe texture. We show that the optical stripe texture can be persistently inhibited by a magnetic field, and a 25T external magnetic field depresses the N-N-tb phase transition temperature by almost 1 degrees C. We propose a quantitative mechanism to account for this shift and suggest a Helfrich-Hurault-type mechanism for the optical stripe formation.

AB - We present magneto-optic measurements on two materials that form the recently discovered twist-bend nematic (N-tb) phase. This intriguing state of matter represents a fluid phase that is orientationally anisotropic in three directions and also exhibits translational order with periodicity several times larger than the molecular size. N-tb materials may also spontaneously form a visible, macroscopic stripe texture. We show that the optical stripe texture can be persistently inhibited by a magnetic field, and a 25T external magnetic field depresses the N-N-tb phase transition temperature by almost 1 degrees C. We propose a quantitative mechanism to account for this shift and suggest a Helfrich-Hurault-type mechanism for the optical stripe formation.

KW - BANANA-SHAPED MOLECULES

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KW - PHASE

KW - DIMERS

KW - INSTABILITY

KW - CHEVRON

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JO - Physical Review. E, Statistical, Nonlinear and Soft Matter Physics

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