磁电阻氧化物La0.7Ca0.3MnO3中的电荷有序化与极化子形成

Charge ordering and polaron formation in the magnetoresistive oxide La0.7Ca0.3MnO3.

作者信息

Adams CP, Lynn JW, Mukovskii YM, Arsenov AA, Shulyatev DA

机构信息

NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8562 and Department of Physics, University of Maryland, College Park, Maryland 20742, USA.

出版信息

Phys Rev Lett. 2000 Oct 30;85(18):3954-7. doi: 10.1103/PhysRevLett.85.3954.

DOI:10.1103/PhysRevLett.85.3954

PMID:11041969

Abstract

Neutron scattering has been used to study the nature of the ferromagnetic transition in a single crystal of the perovskite La0. 7Ca0.3MnO3. Diffuse scattering from lattice polarons develops as the Curie temperature is approached from below, along with short range polaron correlations that are consistent with stripe formation. Both the scattering due to the polaron correlations and the anomalous quasielastic component in the magnetic fluctuation spectrum maximize very close to T(C), in a manner remarkably similar to the resistivity, indicating that they have a common origin.

摘要

中子散射已被用于研究钙钛矿型La0.7Ca0.3MnO3单晶中铁磁转变的本质。当从低于居里温度的方向接近居里温度时，晶格极化子的漫散射会逐渐增强，同时还伴随着与条纹形成相一致的短程极化子关联。极化子关联引起的散射以及磁涨落谱中的反常准弹性分量都在非常接近居里温度T(C)时达到最大值，其方式与电阻率非常相似，这表明它们有共同的起源。