HIGH DIELECTRIC PERMITTIVITY OF CERAMIC AND SINGLE-CRYSTAL PRBA2CU3OX

被引：51

作者：

MAZZARA, GP ^{[1
]}

SKIRIUS, S ^{[1
]}

CAO, G ^{[1
]}

CHERN, G ^{[1
]}

CLARK, RJ ^{[1
]}

CROW, JE ^{[1
]}

MATHIAS, H ^{[1
]}

OREILLY, JW ^{[1
]}

TESTARDI, LR ^{[1
]}

机构：

[1] FLORIDA STATE UNIV,DEPT CHEM,TALLAHASSEE,FL 32306

来源：

PHYSICAL REVIEW B | 1993年 / 47卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.47.8119

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A study of the dielectric response as a function of frequency (10(2)-10(6) Hz) and temperature (4.2-300 K) in ceramic and c-axis-oriented single-crystal samples of PrBa2Cu3Ox reveals dielectric constants > 10(3) at low frequencies in both cases but in different temperature regimes. High-frequency (0.2-20 GHz) measurements of the ceramic sample at room temperature show a loss peak and suggest a relaxation process for the polarization mechanism with characteristic time tau = 0. 5 X 10(-9) s, which is near the electrical diffusivity time. For the single crystal the large polarizability results from a thermally activated process with an activation energy of 0.28 eV and an attempt frequency omega0 of about 10(9) Hz at 300 K. Our results show that the high dielectric constant may be a common feature of the 1:2:3-structure oxide family, and that the previously discovered ordering of the Cu spins at T approximately 300 K in PrBa2Cu3Ox may be accompanied by near ferroelectric polarizability.

引用

页码：8119 / 8123

页数：5

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