Evolution of structure and magnetic properties in electron-doped double perovskites, Sr2-xLaxMnWO6 (0 ≤ x ≤ 1)

被引：27

作者：

Lin, QS

Greenblatt, M ^{[1
]}

Croft, M

机构：

[1] Rutgers State Univ, Dept Chem & Chem Biol, Piscataway, NJ 08854 USA

[2] Rutgers State Univ, Dept Phys, Piscataway, NJ 08854 USA

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2005年 / 178卷 / 05期

基金：

美国国家科学基金会;

关键词：

Sr2-xLaxMnWO6; double perovskite; structure; neutron diffraction; magnetic properties;

D O I：

10.1016/j.jssc.2004.12.031

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Powder neutron and X-ray diffraction studies show that the double perovskites in the region 0 <= x <= 1 exhibit two crystallographic modifications at room temperature: monoclinic P2(1)/n and tetragonal I4/m, with a boundary at 0.75 < x < 0.9. Magnetic Susceptibility measurements indicate that for x = 0 and 0.5 Sr2-xLaxMnWO6 orders antiferromagnetically (AFM) at 15 and 25 K, respectively, for 0.75 <= x < 1.0, a contribution of weak ferromagnetism (FM), probably due to canted-AFM order, increases with increasing x. The end point compound SrLaMnWO6 shows the strongest FM cluster effect; however, no clear evidence of magnetic order is discernable down to 4.2K. X-ray absorption spectroscopy (XAS) confirms Mn2+ and mixed-valent W6+/5+ formal oxidation states in Sr2-xLaxMnWO6. (c) 2005 Elsevier Inc. All rights reserved.

引用

页码：1356 / 1366

页数：11

共 26 条

[1] Nuclear and magnetic structure of Ca2MnWO6:: A neutron powder diffraction study [J].