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Correlations between electronic order and structural distortions and their ultrafast dynamics in the single-layer manganite Pr0.5Ca1.5MnO4

 
: Porer, Michael; Rettig, Laurenz; Bothschafter, Elisabeth Monika; Esposito, Vincent; Versteeg, Rolf B.; Loosdrecht, Paul H.M. van; Savoini, Matteo; Rittmann, Jochen; Kubli, Martin; Lantz, Gabriel; Schumann, Olaf Jochen; Nugroho, Agustinus Agung; Braden, Markus; Ingold, Gerhard; Johnson, Steven L.; Beaud, Paul; Staub, Urs

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Physical Review. B 101 (2020), Nr.7, Art. 075119, 9 S.
ISSN: 0163-1829
ISSN: 1098-0121
ISSN: 0556-2805
ISSN: 2469-9950
Englisch
Zeitschriftenaufsatz
Fraunhofer INT ()

Abstract
Time-resolved x-ray diffraction experiments on the half-doped single-layered manganite Pr0.5Ca1.5MnO4 are used to monitor the ultrafast photoinduced dynamics of the structural distortion associated with the charge and orbital ordering (CO/OO). As in the nonlayered three-dimensional counterpart, the ordered phase melts in less than 100 fs after 800-nm photoexcitation and subsequently partially recovers due to thermal equilibration of electronic and vibrational systems. Photoexciting Pr0.5Ca1.5MnO4 below the transition temperature of a second structural phase transition that occurs around 146 K (deep inside the CO/OO phase) releases this structural transition, but progresses on a much slower timescale. This additional reduction of crystal symmetry, which we ascribe to a further tilt of the oxygen octahedra, can thus be considered to be only weakly coupled to CO/OO. Furthermore, static hard-x-ray and resonant soft-x-ray diffraction at the MnL2,3 edges experiments identify correlations between structural distortions and electronic order in thermal equilibrium.

: http://publica.fraunhofer.de/dokumente/N-582154.html