New phase transition in the Pr1-xCaxMnO3 system:: Evidence for electrical polarization in charge ordered manganites

被引：81

作者：

Lopes, A. M. L. ^{[1
,2
,3
,4
,5
]}

Araujo, J. P. ^{[1
,2
]}

Amaral, V. S. ^{[3
,4
]}

Correia, J. G. ^{[5
,6
]}

Tomioka, Y. ^{[7
]}

Tokura, Y. ^{[8
]}

机构：

[1] Univ Porto, Dept Fis, P-4169007 Oporto, Portugal

[2] Univ Porto, IN IFIMUP, P-4169007 Oporto, Portugal

[3] Univ Aveiro, Dept Fis, P-3810193 Aveiro, Portugal

[4] Univ Aveiro, CICECO, P-3810193 Aveiro, Portugal

[5] CERN EP, CH-1211 Geneva 23, Switzerland

[6] Inst Tecnol Nucl, P-2686953 Sacavem, Portugal

[7] Natl Inst Adv Ind Sci & Technol, CERC, Tsukuba, Ibaraki 3058562, Japan

[8] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 15期

关键词：

D O I：

10.1103/PhysRevLett.100.155702

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In this Letter a detailed study of the electric field gradient (EFG) across the Pr(1-x)Ca(x)MnO(3) phase diagram and its temperature dependence is given. Clearly, distinct EFG behavior for samples outside or inside the charge order (CO) region are observed. The EFG temperature dependence evidences a new phase transition occurring over the broad CO region of the phase diagram. This transition is discontinuous and occurs at temperatures between the charge ordering and the Neel temperatures. The prominent features observed in the EFG are associated with polar atomic vibrations which eventually lead to a spontaneous local electric polarization below CO transition.

引用

页数：4

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