Deoxygenation Enhanced Double-Resistivity-Peak Properties in Polycrystalline La0.7Ca0.3Mn0.92Cr0.08O3-δ |
| |
引用本文: | 方军,田建军,王芳,宋文海,黄真,陈敬林.Deoxygenation Enhanced Double-Resistivity-Peak Properties in Polycrystalline La0.7Ca0.3Mn0.92Cr0.08O3-δ[J].中国物理快报,2004,21(10):2022-2025. |
| |
作者姓名: | 方军 田建军 王芳 宋文海 黄真 陈敬林 |
| |
作者单位: | [1]HighMagneticFieldLaboratory,InstituteofPlasmaPhysics,Hefei230031 [2]KeyLaboratoryofMaterialsPhysics,InstituteofSolidStatePhysics,Hefei230031 |
| |
摘 要: | Influences of deoxygenation on the resistivity and the magnetic properties of La0.7Ca0.3Mn0.92Cr0.08O3-δ(M =Al, Cr) are compared to understand the peculiar doping effect of chromium in the ferromagnetic manganites. It is found that the double resistivity bumps exhibited by the Cr-doped compounds can be tuned by the oxygen content. We have related the double-bump feature with the well-known inefficiency of Cr in lowering Tc, and interpreted both the features consistently in terms of large-scale phase separation. It is suggested that the largescale phase separation is a general characteristic of Cr-doped manganites, and many unusual phenomena exhibited by Cr doping are directly related to the large-scale phase separation.
|
关 键 词: | 磁性材料 脱氧增强 铁磁性亚锰酸盐 铬掺杂 相位分离 多晶结构 |
本文献已被 维普 等数据库收录! |
|