Search

We report a sequent phase transition using high-resolution synchrotron x-ray scattering in a single crystal Nd1/2Sr1/2MnO3. By measuring the peak profile of Bragg reflections, upon cooling, we observed an increase in the width of the Bragg reflections around the Curie temperature (252 K) corresponding to the transition from a paramagnetic to a ferromagnetic state. Below approximately 200 K, dramatic changes in the width and integrated intensity were observed. Changes continued until the formation of charge ordering with q=(12,0,0) at TCO=152 K. This charge ordering was observed to be the first order transition with a large hysteresis width of 10 K. This sequent transition is understood by the formation of different magnetic domains at different temperature ranges as that observed by neutron powder diffraction. [ABSTRACT FROM AUTHOR]

Presents information on a study which described the contribution of high-resolution x-ray diffraction and x-ray reflectivity measurements in characterizing a GaAs/AlInAs/InP hetero-epitaxially growth single quantum well structure. Experimental details; Theory and analysis of the results; Conclusions.

Examines the application of high-resolution triple-crystal x-ray techniques in analyzing the high-temperature superconducting thin films of gadolinium-barium-copper-oxygen grown in situ by direct current magnetron sputtering onto substrates of LaAlO[sub3] and SrTiO[sub3]. Preparation of the thin films; Experimental technique of the study; Results of the measurements with pyrolytic graphite monochromator and analyzer crystals.