Magnetic filaments in resistive manganites -: art. no. 217402

被引：27

作者：

Viret, M ^{[1
]}

Ott, F

Renard, JP

Glättli, H

Pinsard-Gaudart, L

Revcolevschi, A

机构：

[1] CEA Saclay, CNRS,URA 2464, DSM,DRECAM, Serv Phys Etat Condense, F-91191 Gif Sur Yvette, France

[2] CEA Saclay, CNRS, UMR 12, Leon Brillouin Lab, F-91191 Gif Sur Yvette, France

[3] Univ Paris 11, CNRS, UMR 8622, Inst Elect Fondamentale, F-91405 Orsay, France

[4] Univ Paris 11, CNRS, UMR 8648, Lab Physicochim Etat Condense, F-91405 Orsay, France

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 21期

关键词：

D O I：

10.1103/PhysRevLett.93.217402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The magnetic phase separation in single crystals of the Pr0.67Ca0.33MnO3 manganites is studied using polarized small angle neutron scattering. The measured spectra give a fractal dimension consistent with a configuration in ferromagnetic filaments of nanometric diameter. We argue here that localized charge carriers hop in a random walk fashion mediating a ferromagnetic "hopping exchange" which coexists with superexchange to create the filamentary phase separation. The arguments for this physical picture are validated by Monte Carlo simulations, where magnetism and transport are treated in a self-consistent manner.

引用

页数：4

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