氧同位素对La₂CuO₄结构参数和热运动的影响
强关联电子
2014-01-03 v2
摘要
我们通过高分辨率中子衍射实验，研究了氧同位素效应对La₂CuO₄中零点运动、热运动以及结构参数的影响。我们发现晶格参数存在负的氧同位素效应（-0.01%）。对于各向同性热参数，氧同位素效应对镧和铜为正，对氧原子为负。不同方向的各向异性热参数的Rietveld精修表明，每个离子的氧同位素效应符号相同。我们的分析显示，在15 K时，La的各向同性热参数的氧同位素效应最为显著（高达100%），我们发现这主要源于x方向的热运动，正如各向异性热参数精修所确定的那样。
引用
@article{arxiv.0811.0160,
title = {Oxygen isotope effect on structural parameters and on the thermal motion in La$_2$CuO$_4$},
author = {Petra S. Häfliger and Simon Gerber and Ralph Chati and Vladimir Pomjakushin and Kazimierz Conder and Ekaterina Pomjakushina and Loic Le Dreau and Niels B. Christensen and Henrik M. Rønnow},
journal= {arXiv preprint arXiv:0811.0160},
year = {2014}
}
备注
This manuscript was not submitted. Instead, we refer readers to the substantially extended manuscript at 1312.0633, which includes investigation of the consequences of ionic motion in creating a distribution of values for the superexchange parameter J, and a QMC simulation of the consequences for broadening of the dynamical structure factor