X-Ray Scattering Studies Of Charge Stripes In Manganites And Nickelates
STRIPES AND RELATED PHENOMENA(2000)
摘要
Single crystals of both (Bi0.24Ca0.76)MnO3 and (La1.67Sr0.33)NiO4 have been studied extensively using both laboratory and synchrotron radiation x-ray scattering. Using x-ray techniques, we have detected directly the formation of charge stripes. Weak satellite peaks with a modulation wave-vector q approximate to (0.25, 0.25, 0) were observed below the transition temperature in the perovskite (Bi0.24Ca0.76)MnO3 Measurements of the temperature dependence of the intensity and width of the charge-ordering satellites over the temperature range 10-240 K demonstrate that the correlation length of the charge-order stripes is long range at all temperatures and in all directions. A first-order structural phase transition accompanying the charge ordering was also studied. We also undertook SR x-ray measurements on (La1.67Sr0.33)NiO4, and found quasi-2D-fike charge stripes with a modulation wave-vector q approximate to (2/3, 2/3, 1). Detailed critical scattering measurements of the melting of the charge stripes gave critical exponents compatible with those expected of a 2D-Ising system.
更多查看译文
关键词
neutron diffraction,first order,high temperature superconductor,electronic structure,powder diffraction,materials science,nickel,crystal structure,antiferromagnetism,transition temperature,second order,x ray diffraction,critical exponent,single crystal
AI 理解论文
溯源树
样例
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要