@article{3d8af7853dd74efdb1ff6979a8f12dcf,
title = "Study of the phase transition and charge ordering in single-crystalline Nd1/2Sr1/2MnO3 using x-ray scattering",
abstract = "We report a sequent phase transition using high-resolution synchrotron x-ray scattering in a single crystal Nd1/2Sr1/2MnO 3. 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=(1/2,0,0) 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.",
author = "Du, {C. H.} and Ghazi, {M. E.} and Hatton, {P. D.} and Collins, {S. P.} and Murphy, {B. M.} and Kim, {B. G.} and Cheong, {S. W.}",
note = "Funding Information: This paper was supported by a grant from the Engineering and Physical Sciences Research Council. One of the authors (M.E.G.) thanks the Ministry of Science, Research, and Technology of Iran for financial support for his doctoral studies. Work at Rutgers was supported by NSF-DMR-0520471. C.H.D. is thankful for the grant support from the National Science Council, Taiwan, under the NSCT Grant No. 96-2112-M-032-009-MY3. FIG. 1. The evolution of the integrated intensities of the charge ordering reflection (2.5, 0, 2) as a function of temperature. There is an observed hysteresis width of about 10 K due to the first order phase transition. FIG. 2. The evolution of the integrated intensities of the Bragg reflection ( 5 , − 2 , 3 ) as a function of temperature. There is an observed hysteresis width of about 10 K due to the first order phase transition. FIG. 3. Scans through the longitudinal direction of the Bragg peak ( 5 , − 2 , 3 ) displaying changes of the peak width (FWHM) with temperature on cooling and warming. The splitting at T ≈ 180 K can be ascribed to the hysteresis behavior due to the first order phase transition at T CO , and the peak broadening around T ≈ 238 K to the mixture of domains. FIG. 4. Temperature dependence of the correlated domain sizes. Data were extracted from scans through the H , K , and L directions of the Bragg peak ( 5 , − 2 , 3 ) . The evolution can be roughly divided into the regimes of the P (PM state), PF (a mixture of PM and FM states), F (FM state), and AF1 (a mixture of AFM and FM states). ",
year = "2008",
doi = "10.1063/1.2957070",
language = "English (US)",
volume = "104",
journal = "Journal of Applied Physics",
issn = "0021-8979",
publisher = "American Institute of Physics",
number = "2",
}