Low-temperature phase formation of Sn-doped LaMnO3+δ perovskite

被引：5

作者：

Morales, L

Caneiro, A

Vega, D

Zysler, R

Lanza, H

Mercader, RC

机构：

[1] Comis Nacl Energia Atom, Inst Balseiro, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[2] Natl Univ La Plata, IFLP, Dept Fis, RA-1900 La Plata, Argentina

[3] Consejo Nacl Invest Cient & Tecn, RA-1033 Buenos Aires, DF, Argentina

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2002年 / 168卷 / 01期

关键词：

superparamagnetism; magnetic clusters; cation vacancies; cation substitution;

D O I：

10.1006/jssc.2002.9696

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The incorporation of Sn into LaMnO3 perovskite and its influence on magnetotransport properties were studied in samples synthesized at low temperature. Single-phase materials for two series of samples with La/(Sn+Mn)=1 and La/ (Sn + Mn) < 1 ratios were obtained by substitution of up to 10% of the Mn ions by Sn4+. The effect of Sn substitution was monitored through measurements of thermal, "M(T)", and magnetic field, "M(H)", dependences of magnetization, as well as of resistivity, "rho(T)", at 0 and 70kOe. These showed that this effect depends strongly on the perovskite cation site ratio (A/B). For La/(Sn + Mn) = 1, M and T-C were depressed as Sn content was increased. The magnetization data suggest the presence of magnetic clusters with superparamagnetic behavior. No evidence of magnetoresistance (MR) was found. For La/ (Sn + Mn) < 1 ratio, the samples showed ferromagnetic behavior and MR and both M and TC raised as Sn content increased. The results are discussed in terms of A site vacancies. (C) 2002 Elsevier Science (USA).

引用

页码：100 / 109

页数：10

共 34 条

[1] Insulator-metal transitions, giant magnetoresistance, and related aspects of the cation-deficient LaMnO3 compositions La1-delta MnO3 and LaMn1-delta O3 [J].