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Cholesteric pitch-transitions induced by a magnetic field in a sample containing incomplete number of pitches (Articolo in rivista)
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- Cholesteric pitch-transitions induced by a magnetic field in a sample containing incomplete number of pitches (Articolo in rivista) (literal)
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- 2012-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.2478/s11534-012-0050-y (literal)
- Alternative label
Ioannis Lelidis (1,2); Giovanni Barbero (2); Antonio M. Scarfone (3) (2012)
Cholesteric pitch-transitions induced by a magnetic field in a sample containing incomplete number of pitches
in Central European Journal of Physics (Print); Springer, Berlin (Germania)
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- Ioannis Lelidis (1,2); Giovanni Barbero (2); Antonio M. Scarfone (3) (literal)
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- http://link.springer.com/content/pdf/10.2478%2Fs11534-012-0050-y (literal)
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- 1 Solid State Section, Department of Physics, University of Athens, Panepistimiopolis, Zografos, Athens 157 84, Greece
2 Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italia
3 ISC-CNR, Istituto dei Sistemi Complessi - Consiglio Nazionale delle Ricerche, c/o Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italia (literal)
- Titolo
- Cholesteric pitch-transitions induced by a magnetic field in a sample containing incomplete number of pitches (literal)
- Abstract
- We investigate the pitch transitions induced by an external bulk field in a Cholesteric Liquid Crystal slab of
finite thickness ` that contains an incomplete number of ?-twists. The analysis is performed for a magnetic
field that is (i) perpendicular to the helical axis, and (ii) tilted with respect to one of the easy directions
imposed by planar and rigid boundary conditions. For finite ` we obtain a cascade of transitions, where
the bulk expels a half-pitch at a time with increasing field to avoid divergences in the elastic energy. The
dependence of the threshold magnetic field inducing the expulsion on the easy axes twist angle is investigated
for all the cascade of pitch transitions and in particular for the final one, corresponding to the
Cholesteric-Nematic transition. In the ` ! 1limit this dependence disappears and we reobtain the results
of de Gennes for an infinite sample. (literal)
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