Photo-destruction of charge/orbital order in layered perovskite manganite: La0.5Sr1.5MnO4

Ogasawara, T.; Kise, T.; Ishikawa, Tadaharu; Kuwata‐Gonokami, Makoto; Tokura, Y.

doi:10.1016/s0022-2313(99)00338-5

Cited by 6 publications

(5 citation statements)

References 5 publications

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“…Perovskite structured compounds exhibit rich physical behaviour such as ferroelectricity, piezoelectricity, thermoelectricity, birefringence and superconductivity45678. MAPI shows ambipolar charge transport and photo-generated charge diffusion lengths exceeding 100 nm (refs 9, 10).…”

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confidence: 99%

The dynamics of methylammonium ions in hybrid organic–inorganic perovskite solar cells

et al. 2015

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Methylammonium lead iodide perovskite can make high-efficiency solar cells, which also show an unexplained photocurrent hysteresis dependent on the device-poling history. Here we report quasielastic neutron scattering measurements showing that dipolar CH3NH3+ ions reorientate between the faces, corners or edges of the pseudo-cubic lattice cages in CH3NH3PbI3 crystals with a room temperature residence time of ∼14 ps. Free rotation, π-flips and ionic diffusion are ruled out within a 1–200-ps time window. Monte Carlo simulations of interacting CH3NH3+ dipoles realigning within a 3D lattice suggest that the scattering measurements may be explained by the stabilization of CH3NH3+ in either antiferroelectric or ferroelectric domains. Collective realignment of CH3NH3+ to screen a device's built-in potential could reduce photovoltaic performance. However, we estimate the timescale for a domain wall to traverse a typical device to be ∼0.1–1 ms, faster than most observed hysteresis.

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confidence: 99%

The dynamics of methylammonium ions in hybrid organic–inorganic perovskite solar cells

et al. 2015

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“…All show that the local melting of the long-range order occurs in an ultrafast manner, i.e. electronically, within the excitation laser pulse width (≈100 fs = 10 −13 s) [125,126]. Subsequently the heating-up of the lattice occurs during several picoseconds, and then the orbital disorder tends to be remedied by the thermalization process which usually occurs after several nanoseconds.…”

Section: Discussionmentioning

confidence: 96%

Critical features of colossal magnetoresistive manganites

2006

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Colossal magnetoresistance (CMR) phenomena are observed in the perovskite-type hole-doped manganites in which the double-exchange ferromagnetic metal phase and the charge-orbital ordered antiferromagnetic phase compete with each other. The quenched disorder arising from the inherent chemical randomness or the intentional impurity doping may cause major modifications in the electronic phase diagram as well as in the magnetoelectronic properties near the bicritical point that is formed by such a competition of the two phases. One is the phase separation phenomenon on various timescales (from static to dynamic) and on various length-scales (from glass-like nano to grain-like micron). The other is the enhanced phase fluctuation with anomalous reduction in the transition temperatures of the competing phases (and hence in the bicritical-point temperature). The highly effective suppression of such a phase fluctuation by an external magnetic field is assigned here to the most essential ingredient of the CMR physics. Such profound and dramatic features as appearing in the bicritical region are extensively discussed in this paper with ample examples of the material systems specially designed for this purpose. The unconventional phase-controls over the competing phases in terms of magnetic/electric fields and photo-excitations are also exemplified.

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“…However, in what follows we will emphasize the dynamics measured on the HMMs, specifically La 0.7 Ca 0.3 MnO 3 (LCMO, T C = 250-270 K depending on the film quality), La 0.7 Sr 0.3 MnO 3 (LSMO, T C = 350-360 K) and Nd 0.7 Sr 0.3 MnO 3 (NSMO, T C = 180 K). Our emphasis is on these materials since, to date, ultrafast dynamics measurements on manganites at other dopings have not been performed (see [65] for a UOS study of La 0.82 Pb 0.18 MnO 3 and [66,67] for studies of the ultrafast melting of the charge order in Pr 0.7 Ca 0.3 MnO 3 and La 0.5 Sr 1.5 MnO 4 ).…”

Section: Ultrafast Dynamics In Half-metallic Manganitesmentioning

confidence: 99%

Ultrafast optical and far-infrared quasiparticle dynamics in correlated electron materials

Averitt¹,

Taylor

2002

J. Phys.: Condens. Matter

238

214

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We review the application of ultrafast optical spectroscopy in the study of correlated electron materials. The emphasis is on all-optical pump–probe and optical pump–far-infrared probe experiments on (a) colossal-magnetoresistance manganites and (b) high-temperature superconductors. The experimental techniques are discussed followed by a brief review of ultrafast electron dynamics in conventional wide-band metals which serves as a starting point in understanding the dynamics in more complex metallic systems. In the half-metallic manganites, the quasiparticle dynamics in the ferromagnetic metallic state can be understood in terms of a dynamic transfer of spectral weight which is influenced by the lattice and spin degrees of freedom. For the high-temperature superconductors, ultrafast quasiparticle dynamics are sensitive to the order parameter and superconducting pair recovery occurs on a picosecond timescale. These results show that, in general, ultrafast optical spectroscopy provides a sensitive method to probe the dynamics of quasiparticles at the Fermi level.

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Photo-destruction of charge/orbital order in layered perovskite manganite: La0.5Sr1.5MnO4

Cited by 6 publications

References 5 publications

The dynamics of methylammonium ions in hybrid organic–inorganic perovskite solar cells

The dynamics of methylammonium ions in hybrid organic–inorganic perovskite solar cells

Critical features of colossal magnetoresistive manganites

Ultrafast optical and far-infrared quasiparticle dynamics in correlated electron materials

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