Phase-segregated glass formation linked to freezing of structural interface motion

被引：43

作者：

Sharma, P. A. ^{[1
]}

El-Khatib, S. ^{[2
]}

Mihut, I. ^{[3
]}

Betts, J. B. ^{[3
]}

Migliori, A. ^{[3
]}

Kim, S. B. ^{[4
,5
]}

Guha, S. ^{[4
,5
]}

Cheong, S. -W. ^{[4
,5
]}

机构：

[1] Sandia Natl Labs, Dept Mat Phys, Livermore, CA 94551 USA

[2] Los Alamos Natl Lab, Los Alamos Neutron Sci Ctr, Los Alamos, NM 87544 USA

[3] Los Alamos Natl Lab, Nat High Magnet Field Lab, Los Alamos, NM 87544 USA

[4] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08544 USA

[5] Rutgers State Univ, Rutgers Ctr Emergent Mat, Piscataway, NJ 08544 USA

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 13期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.78.134205

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A potentially new kind of glass transition may exist among phase-separated regions in La0.215Pr0.41Ca3/8MnO3. We have observed a very large damping of ultrasonic waves in the dynamically phase-segregated state of this material. This damping is connected to the motion of structural interfaces at megahertz frequencies, which is a much faster time scale than that of magnetic relaxation effects. At lower temperatures, the dynamics of the phase-separated state freeze at the glass transition. Our observations link the onset of this freezing to a sudden decrease in mobility of interfaces between structurally dissimilar phase-segregated regions.

引用

页数：7

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