Electronic structure, phonons, and dielectric anomaly in ferromagnetic insulating double pervoskite La2NiMnO6

被引：189

作者：

Das, Hena ^{[1
]}

Waghmare, Umesh V. ^{[2
]}

Saha-Dasgupta, T. ^{[1
]}

Sarma, D. D. ^{[3
,4
]}

机构：

[1] Satyandranath Bose Natl Ctr Basic Sci, Kolkata 700098, India

[2] Indian Inst Sci, Jawaharlal Nehru Ctr Adv Sci Res, Bangalore 560064, Karnataka, India

[3] Ctr Adv Mat, Indian Assoc Cultivat Sci, Kolkata 700032, India

[4] Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka, India

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.100.186402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using first-principles density functional calculations, we study the electronic and magnetic properties of the ferromagnetic insulating double perovskite compound La2NiMnO6, which has been reported to exhibit an interesting magnetic field sensitive dielectric anomaly as a function of temperature. Our study reveals the existence of very soft infrared active phonons that couple strongly with spins at the Ni and Mn sites through modification of the superexchange interaction. We suggest that these modes are the origin for the observed dielectric anomaly in La2NiMnO6.

引用

页数：4

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