Ferromagnetic insulating state in manganites: Mn-55 NMR study

Article

关键词: LOCAL-STRUCTURE;    MAGNETIC-FIELD;    PHASE;    LA1-XSRXMNO3;    SEGREGATION;    TRANSITION;    PRESSURE;    CRYSTALS;    ORDER;    NQR;   

DOI  :  10.1103/PhysRevB.67.094403

来源: SCIE

【 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)

【 授权许可】

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