Chemical pressure effects of cation size variation in layered manganites

被引：16

作者：

Dho, J ^{[1
]}

Kim, WS ^{[1
]}

Choi, HS ^{[1
]}

Chi, EO ^{[1
]}

Hur, NH ^{[1
]}

机构：

[1] Korea Res Inst Stand & Sci, Ctr CMR Mat, Taejon 305600, South Korea

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2001年 / 70卷 / 08期

关键词：

CMR; layered manganites; magnetization; electric resistivity; ferromagnetic order; spin-glass behavior;

D O I：

10.1143/JPSJ.70.2448

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have investigated the electric and magnetic properties of the layered manganite (La1-gRmu)(2-2x)Sr1+2xMn2O7 (R = Pr, Nd. Sm. Eu. Gd: x = 0.3) with the fixed doping concentration. The average ionic radius of the La/Sr site <r(A)> is varied by the replacement of the La ion with different rare earth ion. For <r(A)> similar to 1.3963 Angstrom, we observed the metal-insulator transition accompanied by the ferromagnetic (FM) ordering near 75 K and subsequently the spin-glass-like transition near 30 K. For <r(A)> less than or equal to 1.3895 Angstrom, the metallic FM state disappears and instead the non-metallic spin-glass-like phase appears around 30 K. With decreasing <r(A)>, the FM double exchange interaction is weakened and resultantly the antiferromagnetic (AFM) superexchange interaction is developed. These magnetic and transport properties in the layered manganite system are found to be primarily dependent on the size of <r(A)>.

引用

页码：2448 / 2453

页数：6

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