DISCONTINUITY AND QUASI-TRICRITICAL BEHAVIOR NEAR T(C) IN FERROELECTRIC TRIGLYCINE SELENATE

被引：20

作者：

IGLESIAS, T ^{[1
]}

NOHEDA, B ^{[1
]}

LIFANTE, G ^{[1
]}

GONZALO, JA ^{[1
]}

KORALEWSKI, M ^{[1
]}

机构：

[1] ADAM MICKIEWICZ UNIV POZNAN, INST PHYS, PL-60780 POZNAN, POLAND

来源：

PHYSICAL REVIEW B | 1994年 / 50卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.50.10307

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Precise dielectric-constant and hysteresis-loops measurements at very low heating and cooling rates (approximately 0.5-degrees-C/h) near T(c) almost-equal-to 22.0-degrees-C in single crystals of triglycine selenate reveal previously unobserved discontinuities and a very small thermal hysteresis (DELTAT almost-equal-to 0.05-degrees-C), indicative of a first-order transition very close to a tricritical point. The set of tricritical exponents beta almost-equal-to 1/4, delta almost-equal-to 5, gamma almost-equal-to 1, borne out by present data, and alpha almost-equal-to 1/2 (from Ema's specific-heat data) describe very well the observed behavior in the vicinity of the phase transition.

引用

页码：10307 / 10310

页数：4

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