Anomaly in the dielectric response at the charge-orbital-ordering transition of Pr0.67Ca0.33MnO3 -: art. no. 174433

被引：59

作者：

Mercone, S ^{[1
]}

Wahl, A ^{[1
]}

Pautrat, A ^{[1
]}

Pollet, M ^{[1
]}

Simon, C ^{[1
]}

机构：

[1] ENSICAEN, Lab CRISMAT, CNRS, UMR 6508, F-14050 Caen, France

来源：

PHYSICAL REVIEW B | 2004年 / 69卷 / 17期

关键词：

D O I：

10.1103/PhysRevB.69.174433

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The complex impedance of a Pr0.67Ca0.33MnO3 crystal has been measured. The frequency dependence is studied for a wide range of temperatures (50-403 K) and is found to be characteristic of relaxation process with a single Debye time relaxation constant, which is interpreted as a dielectric constant of the material. A strong peak is observed in this dielectric constant (up to 10(6)) at the charge ordering transition suggesting an interpretation in terms of ordering electric dipoles at T-CO or in term of phase separation. Comparison with Pr0.63Ca0.37MnO3-in which the phase separation is much smaller and the peak in the dielectric constant is absent-suggests an interpretation in term of phase separation between insulating and metallic states.

引用

页码：174433 / 1

页数：6

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