TRICRITICAL EXPONENTS FOR THE ISOTROPIC-NEMATIC TRANSITION - EXPERIMENTAL-VERIFICATION

被引：86

作者：

KEYES, PH ^{[1
]}

SHANE, JR ^{[1
]}

机构：

[1] MIT,FRANCIS BITTER NATL MAGNET LAB,CAMBRIDGE,MA 02139

来源：

PHYSICAL REVIEW LETTERS | 1979年 / 42卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.42.722

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The gap exponent for the isotropic-nematic phase transition in MBBA (N-[p-methoxybenzylidine]-p-butylaniline) has been determined from measurements of the induced birefringence in very strong magnetic fields. The experimental value, Δ=1.26±0.10, is consistent with the tricritical exponent, Δ=54, but is clearly inconsistent with the exponent Δ=2 predicted by the mean-field theory. It is also shown that some of the observed effects are more than two orders of magnitude larger than the values predicted by the mean-field theory. © 1979 The American Physical Society.

引用

收藏

页码：722 / 725

页数：4

相关论文

共 11 条

[1] PHASE-TRANSITIONS IN A FLUID OF BIAXIAL PARTICLES [J].

ALBEN, R .

PHYSICAL REVIEW LETTERS, 1973, 30 (17) :778-781

[2] SHORT RANGE ORDER EFFECTS IN ISOTROPIC PHASE OF NEMATICS AND CHOLESTERICS [J].

DEGENNES, PG .

MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1971, 12 (03) :193-+

[3] TRICRITICAL BEHAVIOR AT ISOTROPIC-NEMATIC TRANSITION [J].

KEYES, PH .

PHYSICS LETTERS A, 1978, 67 (02) :132-134

[4] FREE-ENERGY AS A FUNCTION OF ORDER PARAMETER IN NEMATIC LIQUID-CRYSTALS [J].

POGGI, Y ;

FILIPPINI, JC ;

ALEONARD, R .

PHYSICS LETTERS A, 1976, 57 (01) :53-56

[5] CRITICAL PROPERTIES OF 2 TENSOR MODELS WITH APPLICATION TO PERCOLATION PROBLEM [J].

PRIEST, RG ;

LUBENSKY, TC .

PHYSICAL REVIEW B, 1976, 13 (09) :4159-4171

[6] TRICRITICAL EXPONENTS AND SCALING FIELDS [J].

RIEDEL, EK ;

WEGNER, FJ .

PHYSICAL REVIEW LETTERS, 1972, 29 (06) :349-&

[7] PRETRANSITIONAL PHENOMENA IN ISOTROPIC PHASE OF A NEMATIC LIQUID CRYSTAL [J].

STINSON, TW ;

LITSTER, JD .

PHYSICAL REVIEW LETTERS, 1970, 25 (08) :503-&

[8] CRITICAL EXPONENTS FOR LANDAU POINT TO ORDER EPSILON-2 [J].

VAUSE, C ;

SAK, J .

PHYSICS LETTERS A, 1978, 65 (03) :183-184

[9] THEORY OF LANDAU CRITICAL-POINT .1. MEAN-FIELD THEORY, SCALING THEORY, AND CRITICAL EXPONENTS TO ORDER EPSILON-2 [J].

VAUSE, C ;

SAK, J .

PHYSICAL REVIEW B, 1978, 18 (03) :1455-1463

[10]

VIGMAN PB, 1976, SOV PHYS JETP, V41, P944