Temperature and field dependence of microwave losses in manganite powders

被引：91

作者：

Srinivasu, VV ^{[1
]}

Lofland, SE

Bhagat, SM

Ghosh, K

Tyagi, SD

机构：

[1] Univ Maryland, Dept Phys, College Pk, MD 20742 USA

[2] Univ Maryland, Ctr Superconduct Res, College Pk, MD 20742 USA

[3] Drexel Univ, Dept Phys, Philadelphia, PA 19104 USA

[4] Rowan Coll, Dept Chem & Phys, Glassboro, NJ 08028 USA

来源：

JOURNAL OF APPLIED PHYSICS | 1999年 / 86卷 / 02期

关键词：

D O I：

10.1063/1.371146

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report systematic measurements of the temperature and field dependence of microwave losses in micron-size powders (similar to 3 mu m) of the manganites Nd0.7Sr0.3MnO3, La0.7Ca0.3MnO3, La0.8Ba0.2MnO3, and La1.4Ca1.6Mn2O7. We fully confirm previous findings of a large increase in zero-field absorption, in La0.7Ba0.3MnO3 and La0.7Sr0.3MnO3, accompanying the onset of ferromagnetism and a concomitant colossal low-field magnetoimpedance (up to 80% at 600 Oe at room temperature). An oversimplified set of computations renders plausible support for interpreting these observations as arising from absorption in the spin system. Possible applications of these novel phenomena are also described. (C) 1999 American Institute of Physics. [S0021-8979(99)05814-4].

引用

页码：1067 / 1072

页数：6

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