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24 April 2024

» arxiv » 1007.2887

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Sharp versus Continuous First Order Structural Phase Transition and Role of Superlattice Misfit Strain in RFeAsO (R=La, Pr, Nd and Sm)
Alessandro Ricci ; Nicola Poccia ; B. Joseph ; Luisa Barba ; Gianmichele Arrighetti ; Gabriele Ciasca ; J.-Q. Yan ; R.W. McCallum ; T.A. Lograsso ; N. D. Zhigadlo ; J. Karpinski ; Antonio Bianconi ;
Date:	17 Jul 2010
Abstract:	The structural phase transition in LaFeAsO (La-1111) and SmFeAsO (Sm-1111) single crystals measured by ultra-high resolution x-ray diffraction is found to be as sharp as in the AFe2As2 (A=Ca, Sr, Ba) systems while the RFeAsO (R=La, Nd, Pr, Sm) polycrystalline samples show a broad continuous phase transition as observed previously. The critical exponents of the structural phase transition are found to be the same for the polycrystalline and the single crystal samples, while the correlation length critical exponents are found to be very different for the single crystal and the polycrystalline powder.
Source:	arXiv, 1007.2887
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