Magnetic investigation of Mn ions in La,Mn:SrTiO3

被引：5

作者：

Azzoni, CB

Mozzati, MC

Galinetto, P

Paleari, A

Massarotti, V

Bini, M

Capsoni, D

机构：

[1] Univ Pavia, INFM, Dipartimento Fis Alessandro Volta, I-27100 Pavia, Italy

[2] Univ Milan, Dipartimento Sci Mat, INFM, I-20125 Milan, Italy

[3] Univ Pavia, Dipartimento Chim Fis, I-27100 Pavia, Italy

[4] Univ Pavia, CNR, CSTE, I-27100 Pavia, Italy

来源：

SOLID STATE COMMUNICATIONS | 2000年 / 116卷 / 06期

关键词：

disordered systems; grain boundaries; x-ray scattering; electron paramagnetic resonance; static magnetic susceptibility;

D O I：

10.1016/S0038-1098(00)00339-2

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Electron paramagnetic resonance (EPR) and static magnetic susceptibility measurements were carried out on lanthanum-manganese substituted (up to 10 mol%) strontium titanate polycrystalline samples. X-ray diffraction (XRD) analysis revealed in each sample a single cubic perovskite phase with a different lattice parameter. Only weak and narrow EPR signals from a small fraction of Mn2+ and Mn4+ ions were observed when the La and Mn content did not exceed 5 mol%, indicating the nearly complete stabilisation of the Mn3+ oxidation state. Heavily substituted samples showed another EPR signal, very broad and with intensity and resonance field strongly temperature dependent. For these samples, a complex dynamics of Mn3+ stabilisation is suggested, supported by micro-Raman data. (C) 2000 Published by Elsevier Science Ltd.

引用

页码：303 / 308

页数：6

共 8 条

[1] Magnetic properties and Mn mixed valence in Bi2Sr2MnO6+x, and BiPbSr2MnO6 [J].