Charge melting and polaron collapse in La1.2Sr1.8Mn2O7

被引:154
作者
Vasiliu-Doloc, L [1 ]
Rosenkranz, S
Osborn, R
Sinha, SK
Lynn, JW
Mesot, J
Seeck, OH
Preosti, G
Fedro, AJ
Mitchell, JF
机构
[1] No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA
[2] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA
[3] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
[4] Argonne Natl Lab, Argonne, IL 60439 USA
关键词
D O I
10.1103/PhysRevLett.83.4393
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
X-ray and neutron scattering measurements directly demonstrate the existence of polarons in the paramagnetic phase of optimally doped colossal magnetoresistive oxides. The polarons exhibit short-range correlations that grow with decreasing temperature, but disappear abruptly at the ferromagnetic transition because of the sudden charge delocalization. The "melting" of the charge ordering as we cool through T-C occurs with the collapse of the quasistatic polaron scattering, and provides important new insights into the relation of polarons to colossal magnetoresistance.
引用
收藏
页码:4393 / 4396
页数:4
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