Author:
Kubli Martin,Savoini Matteo,Abreu Elsa,Burganov Bulat,Lantz Gabriel,Huber Lucas,Neugebauer Martin,Boie Larissa,Esposito Vincent,Bothschafter Elisabeth,Parchenko Sergii,Grübel Sebastian,Porer Michael,Rittmann Jochen,Beaud Paul,Staub Urs,Yabashi Makina,Tanaka Yoshikazu,Katayama Tetsuo,Togashi Tadashi,Kohutych Anton,Vysochanskii Yulian,Johnson Steven
Abstract
We investigate the structural dynamics of the incommensurately modulated phase of Sn 2P 2Se 6 by means of time-resolved X-ray diffraction following excitation by an optical pump. Tracking the incommensurable distortion in the time domain enables us to identify the transport effects leading to a complete disappearance of the incommensurate phase over the course of 100 ns. These observations suggest that a thin surface layer of the high-temperature phase forms quickly after photo-excitation and then propagates into the material with a constant velocity of 3.7 m/s. Complementary static structural measurements reveal previously unreported higher-order satellite reflection in the incommensurate phase. These higher-order reflections are attributed to cubic vibrational terms in the Hamiltonian.
Subject
Fluid Flow and Transfer Processes,Computer Science Applications,Process Chemistry and Technology,General Engineering,Instrumentation,General Materials Science
Cited by
2 articles.
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