Evolution of the low-frequency spin dynamics in ferromagnetic manganites

被引：149

作者：

Fernandez-Baca, JA ^{[1
]}

Dai, P

Hwang, HY

Kloc, C

Cheong, SW

机构：

[1] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[2] Lucent Technol, Bell Labs, Murray Hill, NJ 07974 USA

[3] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08855 USA

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 80卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.80.4012

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Neutron scattering was used to study the ferromagnetic manganites Nd0.7Sr0.3MnO3 (T-C = 197.9 K) and PT0.63Sr0.37MnO3 (T-C = 300.9 K). The spin dynamical behavior of these two systems is similar at low temperatures but drastically different at temperatures around T-C. While the formation of spin clusters of size (similar to 20 Angstrom) dominates the spin dynamics of the 197.9 K sample close to T-C, the paramagnetic to ferromagnetic transition for the 300.9 K sample is mon conventional. These results, combined with seemingly inconsistent earlier reports, reveal clear systematics in the spin dynamics of the manganites.

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页码：4012 / 4015

页数：4

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