Ultraslow polaron dynamics in low-doped manganites from 139La NMR-NQR and muon spin rotation -: art. no. 127206

被引:45
作者
Allodi, G
Guidi, MC
De Renzi, R
Caneiro, A
Pinsard, L
机构
[1] Univ Parma, Dipartimento Fis, I-43100 Parma, Italy
[2] Univ Parma, Ist Nazl Fis Mat, I-43100 Parma, Italy
[3] Ctr Atom Bariloche, San Carlos De Bariloche, Rio Negro, Argentina
[4] Univ Paris 11, UMR 8648, Lab Physicochim Solides, F-91405 Orsay, France
关键词
D O I
10.1103/PhysRevLett.87.127206
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We report a La-139 NMR investigation of low-doped insulating manganite samples (LaMnO3+delta and La1-yCayMnO3+delta) as a function of temperature. A volume fraction with fast nuclear relaxations was revealed by the inhomogeneous loss of the NMR signal over a broad temperature interval. Comparison with muon spin rotation data demonstrates that the wipeout of the La-139 signal is mainly due to slowly fluctuating electric field gradients. This provides strong evidence for the slow diffusion,of lattice excitations, identified with Jahn-Teller small polarons.
引用
收藏
页码:1 / 127206
页数:4
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