Direct observation of electronic-liquid-crystal phase transitions and their microscopic origin in La1/3Ca2/3MnO3

被引：0
作者：
J. Tao
K. Sun
W.-G. Yin
L. Wu
H. Xin
J. G. Wen
W. Luo
S. J. Pennycook
J. M. Tranquada
Y. Zhu
机构：
[1] Brookhaven National Laboratory,Condensed Matter Physics & Materials Science Department
[2] University of Michigan,Department of Physics
[3] Center for Functional Nanomaterials,Department of Physics & Astronomy
[4] Brookhaven National Laboratory,Department of Materials Science and Engineering
[5] Center for Nanoscale Materials,undefined
[6] Argonne National Laboratory,undefined
[7] 9700 S. Cass Avenue,undefined
[8] Shanghai JiaoTong University,undefined
[9] National University of Singapore,undefined
来源：
Scientific Reports | / 6卷
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摘要：
The ground-state electronic order in doped manganites is frequently associated with a lattice modulation, contributing to their many interesting properties. However, measuring the thermal evolution of the lattice superstructure with reciprocal-space probes alone can lead to ambiguous results with competing interpretations. Here we provide direct observations of the evolution of the superstructure in La1/3Ca2/3MnO3 in real space, as well as reciprocal space, using transmission electron microscopic (TEM) techniques. We show that the transitions are the consequence of a proliferation of dislocations plus electronic phase separation. The resulting states are well described by the symmetries associated with electronic-liquid-crystal (ELC) phases. Moreover, our results resolve the long-standing controversy over the origin of the incommensurate superstructure and suggest a new structural model that is consistent with recent theoretical calculations.
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