Chemical pressure effect on magnetic properties in electron-doped perovskite manganites (Gd0.08CaySr0.92-y)MnO3 (0 < y < 1):: Percolation transition of ferromagnetic clusters -: art. no. 094419

被引：20

作者：

Hirano, S ^{[1
]}

Sugiyama, J ^{[1
]}

Noritake, T ^{[1
]}

Tani, T ^{[1
]}

机构：

[1] Toyota Cent Res & Dev Labs Inc, Aichi 4801192, Japan

来源：

PHYSICAL REVIEW B | 2004年 / 70卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.70.094419

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetic properties of electron-doped perovskite manganites, (GdxCaySr1-x-y)MnO3 (x=0.08 and 0.05, 0.1less than or equal toy<1), were investigated as a function of the average ionic radius of the A-site cations (i.e., Gd, Ca and Sr), <r(A)>using polycrystalline samples. For the samples with x=0.08, as y increased from 0, the low temperature phase changed from an antiferromagnetic insulator (AFI) to a ferromagnetic metal (FM) at ysimilar to0.35 which corresponds to <r(A)>=1.25 Angstrom. The magnitude of the Neel temperature was found to correlate with the bandwidth of the Mn-3d band. On the other hand, for the samples with y>0.5, a small saturation magnetization suggested the coexistence of the FM and AFI phase; in other words, magnetic phase separation occurred below the Curie temperature (similar to120 K). A scaling analysis of the resistivity of (Gd0.08CaySr0.92-y)MnO3 indicated that a percolation transition between FM clusters was induced by the decrease in <r(A)>.

引用

页码：094419 / 1

页数：8

共 35 条

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