Polaron formation in the optimally doped ferromagnetic manganites La0.7Sr0.3MnO3 and La0.7Ba0.3MnO3

被引：32

作者：

Chen, Y. ^{[1
,2
]}

Ueland, B. G. ^{[1
]}

Lynn, J. W. ^{[1
]}

Bychkov, G. L. ^{[3
]}

Barilo, S. N. ^{[3
]}

Mukovskii, Y. M. ^{[4
]}

机构：

[1] Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[2] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

[3] Byelarussian Acad Sci, Inst Solid State & Semicond Phys, Minsk 220072, BELARUS

[4] Moscow State Steel & Alloys Inst, Moscow 119049, Russia

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 21期

关键词：

barium compounds; colossal magnetoresistance; ferromagnetic materials; ferromagnetic-paramagnetic transitions; lanthanum compounds; magnetic polarons; neutron diffraction; strontium compounds;

D O I：

10.1103/PhysRevB.78.212301

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The nature of the polarons in the optimally doped colossal magnetoresistive materials La0.7Ba0.3MnO3 (LBMO) and La0.7Sr0.3MnO3 (LSMO) is studied by elastic and inelastic neutron scattering. In both materials, dynamic nanoscale polaron correlations develop abruptly in the ferromagnetic state. However, the polarons are not able to lock-in to the lattice and order, in contrast to the behavior of La0.7Ca0.3MnO3. Therefore ferromagnetic order in LBMO and LSMO survives their formation, explaining the conventional second-order nature of the ferromagnetic-paramagnetic transition. Nevertheless, the results demonstrate that the fundamental mechanism of polaron formation is a universal feature of these ferromagnetic perovskite manganites.

引用

页数：4

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