Picosecond energy relaxation in

Dorosinets, V.A.; Richter, P.; Mohler, E.; Roskos, Hartmut G.; Jakob, G.

doi:10.1016/j.physb.2005.01.362

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…So gibt es Vorgänge wie z. B. die Änderung der Reflektivität, die im Bereich von Subpikosekunden[Wu+09] bis einige zehn Pikosekunden[Dor+05] relaxieren kann, oder laserinduzierte Leitfähigkeit, bei der eine Komponente in ∼ 150 ps relaxiert[Zha+98], und schließlich Phänomene, die von der Spindynamik abhängen, wie u. a. die Magnetisierungsänderung, mit Zeitskalen von Nano-oder Mikrosekunden [Oga+03; Ren+08; Ren+04; Fie+00; Mül+09]. Je nachdem, welche Relaxationszeit man zugrunde legt, ergibt sich ein anderer Faktor, mit welchem man den gemessenen Effekt ∆ m skalieren muss, um die ursprünglich Veränderung ∆ i zu erhalten.…”

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Laserinduzierte Änderungen der elektronischen Transporteigenschaften von Manganaten

Mchalwat¹

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Laserinduzierte Änderungen der elektronischen Transporteigenschaften von Manganaten

Mchalwat¹

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Ultrafast optical probes of polaron dynamics in La0.7Ca0.3MnO3 thin films

Hsu

Shih

et al. 2009

Journal of Applied Physics

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In this work, we use ultrafast optical pump-optical probe spectroscopy to probe the polaron dynamics in La0.7Ca0.3MnO3 (LCMO) thin films. The temporal evolution in transient reflectivity change ΔR/R exhibits two relaxing components: a fast component with a time constant of subpicosecond and a slow component with time constant ranging from tens of picoseconds to hundreds of picoseconds. The amplitude of the fast component, though has been seldom discussed before, exhibits the similar temperature dependence with that of the resistivity and the neutron scattering intensity due to nanoscale correlated polarons. The results strongly suggest that the fast photoinduced reflectivity change may have been due to the photoexcitation and trapping process of correlated Jahn–Teller polarons in the paramagnetic and ferromagnetic phases and, thus, implies the presence of electronic inhomogeneity in LCMO manganites.

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Coherent acoustic modulation and defect-sensitive ultrafast carrier dynamics of Pr0.5Ca0.5MnO3 thin films investigated by time-resolved terahertz spectroscopy

Kinha

Udeshi

Dagar

et al. 2022

Journal of Applied Physics

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In transition metal oxides, the potential of competing energetics of interacting fundamental entities is best displayed in perovskite manganites via the formation of a variety of exotic phases; however, there are limitations of extreme sensitivity to extrinsic and intrinsic defects and the slightest of structural modulations. Here, we report the effect of oxygen annealing and epitaxial strain on the ultrafast carrier excitation and relaxation mechanism in charge-ordered (CO) manganite Pr0.5Ca0.5MnO3 (PCMO) thin films of 60 and 150 nm thicknesses, both as-grown and oxygen annealed, as investigated by optical pump–terahertz (THz) probe measurements. Transient THz transmittance is negative for both films. Bi-exponential relaxation behavior accompanied with acoustic modulations was observed that varies along with strain and oxygen content of the films. As fitted by the sum of exponentials, the fast relaxation time constant is found to be fluence independent, while the slow relaxation time constant decreases with pump fluence for both films and is less for the annealed film suggesting that the relaxation in PCMO strongly depends on strain and oxygen content. This study on non-equilibrium carrier dynamics depicting the sensitivity of defects and subtle structural modifications is unprecedented in demonstrating the ultrafast control of CO manganites.

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Picosecond energy relaxation in

Cited by 4 publications

References 5 publications

Laserinduzierte Änderungen der elektronischen Transporteigenschaften von Manganaten

Laserinduzierte Änderungen der elektronischen Transporteigenschaften von Manganaten

Ultrafast optical probes of polaron dynamics in La0.7Ca0.3MnO3 thin films

Coherent acoustic modulation and defect-sensitive ultrafast carrier dynamics of Pr0.5Ca0.5MnO3 thin films investigated by time-resolved terahertz spectroscopy

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