Sound velocity in perovskite manganites La0.67Ca0.33MnO3 with different grain sizes

被引：11

作者：

Ewe, L. S. ^{[1
,3
]}

Hamadneh, Imad ^{[2
]}

Salama, Hazar A. ^{[2
]}

Abd-Shukor, R. ^{[1
]}

机构：

[1] Univ Kebangsaan Malaysia, Sch Appl Phys, Bangi 43600, Selangor, Malaysia

[2] Univ Putra Malaysia, Fac Sci, Dept Chem, Serdang 43400, Selangor, Malaysia

[3] Univ Tenaga Nas, Coll Engn, Kajang 43009, Selangor, Malaysia

来源：

PHYSICA B-CONDENSED MATTER | 2008年 / 403卷 / 13-16期

关键词：

sound velocity; Debye temperature; grain size; manganites;

D O I：

10.1016/j.physb.2007.12.022

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The longitudinal and shear sound velocities in colossal magnetoresistive material La0.67Ca0.33MnO3 sintered at 1100, 1250 and 1350 degrees C with average grain size 1, 3 and 5 mu m, respectively, have been measured from 80 to 300 K using the pulse-echo-overlap method. A pronounced increase in the longitudinal sound velocity was observed in all samples around the insulator-metal transition temperature (T-IM similar to 272 K). XRD patterns showed the orthorhombic structure for all samples. The longitudinal and shear velocities showed the largest hysteresis for the sample with 3 mu m grain size. A step-like shear sound velocity anomaly near 120 K during cooling or warming was observed to be dependent on the grain size. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：2394 / 2398

页数：5

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