TY - JOUR
T1 - Integrated x-ray-scattering intensity measurement of the order parameter at the nematic-to-smectic-A phase transition
AU - Chan, Kelby K.
AU - Deutsch, Moshe
AU - Ocko, B. M.
AU - Pershan, P. S.
AU - Sorensen, L. B.
PY - 1985
Y1 - 1985
N2 - The temperature dependence of the square of the smectic order parameter, Ψ2, was determined from the integrated x-ray scattering intensity. The data are described very well by the form I(t)/I(0)=1A(±)tx, where t=(T-TNA)/TNA. The determined values for x do not agree with the theoretically expected value x=1-α, where α is the heat-capacity exponent. This disagreement raises questions concerning the quantitative validity of the Landau-de Gennes free energy.
AB - The temperature dependence of the square of the smectic order parameter, Ψ2, was determined from the integrated x-ray scattering intensity. The data are described very well by the form I(t)/I(0)=1A(±)tx, where t=(T-TNA)/TNA. The determined values for x do not agree with the theoretically expected value x=1-α, where α is the heat-capacity exponent. This disagreement raises questions concerning the quantitative validity of the Landau-de Gennes free energy.
UR - http://www.scopus.com/inward/record.url?scp=4243382468&partnerID=8YFLogxK
U2 - 10.1103/physrevlett.54.920
DO - 10.1103/physrevlett.54.920
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AN - SCOPUS:4243382468
SN - 0031-9007
VL - 54
SP - 920
EP - 923
JO - Physical Review Letters
JF - Physical Review Letters
IS - 9
ER -