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Ultrafast dynamics of orbital-order-induced polarization
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10.1063/1.4812657
/content/aip/journal/apl/102/25/10.1063/1.4812657
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/25/10.1063/1.4812657
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Figures

Image of FIG. 1.
FIG. 1.

(a) and (b) Schematics of the orbital states in the PSMO/LSAT(110) film below (a) and above (b) the spin-A-type OO transition temperature, together with the optical geometry. Shear-mode distortion of the lattice (blue paralellogram) and concomitant displacement of the cations (green arrows) are indicated in (a). The incident plane (grey plane) is parallel to ( ), which is plane with the Cartesian coordinate where is parallel to [110] in pseudocubic notation. (c) Temperature dependence of the () and () polarized SHG corresponding to PMM, FMM, and the OO with spin-A-type AFM phases. The data for the () polarization are multiplied by 3.5. The time-resolved SH polarimetry was executed at 150 K, which is indicated with a solid arrow. A dashed line shows the temperature slope of the () polarized SHG in the FMM phase. (d) Temperature dependence of optical conductivity. The fundamental photon energy for the SHG measurement is indicated with a dashed line.

Image of FIG. 2.
FIG. 2.

(a) Temperature dependence of the SH polarization patterns for ( ) geometry (-polarized fundamental incidence, and the analyzer is rotated) corresponding to those for the FMM phase (170 K) and the OO phase (150 K). (b) Time evolution of the polarization pattern at 150 K after pump excitation. Apartial decrease of the () polarized SH can be seen. However, the high temperature phase (see the pattern at 170 K in (a)) does not appear. The data at −2.7 ps and 10.8 ps are shown with open circles with fitting curves (dotted grey lines). The () polarized SH shows return to the initial state after ∼100 ps.

Image of FIG. 3.
FIG. 3.

(a) Temperature and polarization dependence of the transient SH intensity. The data for the () polarization are plotted with offsets (0.05 each) for clarity. Solid horizontal lines indicate the SH intensity without pump excitation. (b) Transient SHG for the () polarization at a short time scale, indicating the ultrafast responses of the polar order. (c) Transient linear reflectivity for the -polarization under the same optical setup and incident fluence with (a). (d) Pump intensity dependence of the SH response at time 0. Dashed line is a guide to the eye.

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/content/aip/journal/apl/102/25/10.1063/1.4812657
2013-06-28
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ultrafast dynamics of orbital-order-induced polarization
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/25/10.1063/1.4812657
10.1063/1.4812657
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