Ferromagnetic insulating state in manganites:: 55Mn NMR study -: art. no. 094403

被引：22

作者：

Savosta, MM

Kamenev, VI

Borodin, VA

Novák, P

Marysko, M

Hejtmánek, J

Dörr, K

Sahana, M

机构：

[1] Natl Acad Sci Ukraine, Donetsk Inst Phys & Tech, UA-83114 Donetsk, Ukraine

[2] Acad Sci Czech Republic, Inst Phys, Prague 18221 8, Czech Republic

[3] IWF Dresden, Inst Solid State & Mat Res, D-01171 Dresden, Germany

来源：

PHYSICAL REVIEW B | 2003年 / 67卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.67.094403

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Mn-55 NMR was used to study the ferromagnetic insulating state in four different manganites. In all cases the coexistence of two types of regions possessing different NMR spectra and nuclear-spin dynamics was found. In the ferromagnetic insulating clusters the hopping frequency f(hop) of the electron holes is slower comparing to the NMR frequency f(res) and two lines ascribed to 3+ and 4+ valence state of Mn are observed. The relaxation rate increases rapidly with the increasing temperature, so that these spectra can no longer be detected for temperatures higher than approximate to60 K. In ferromagnetic metallic clusters f(res)<f(hop) and the motionally narrowed spectrum is observed in a broad temperature interval, as the relaxation remains only moderately fast.

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