Detecting charge and lattice dynamics in photoinduced charge-order melting in perovskite-type manganites using a 30-femtosecond time resolution

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Hiroyuki Matsuzaki,¹ Hirotaka Uemura,¹ Masakazu Matsubara,² Tsuyoshi Kimura,³ Yoshinori Tokura,^2,3 and Hiroshi Okamoto^1,2,4
¹Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
²National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8562, Japan
³Department of Applied Physics, University of Tokyo, Tokyo 113-8856, Japan
⁴CREST–JST, Kawaguchi, Saitama 332-0012, Japan

Received 13 April 2009; revised 31 May 2009; published 24 June 2009

Weinvestigated the ultrafast dynamics of photoinduced melting of charge andorbital order in a perovskite-type manganite, Nd_0.5Ca_0.5MnO₃, by means ofpump-probe reflection spectroscopy. By irradiation with a 20-fs laser pulse,only the charge sectors become melted within ~30 fs through strongelectron correlations. During this process the oxygen displacements associated withthe ordered phase persist. These displacements are subsequently released accompaniedby several coherent oscillations. The coherent oscillation corresponding to theJahn-Teller mode has relatively large amplitude demonstrating that the orbitalorder plays a significant role on the stabilization of thecharge order.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.79.235131
DOI:	10.1103/PhysRevB.79.235131
PACS:	78.47.J-; 75.47.Lx; 78.30.-j; 78.40.Ha 78.47.J- Ultrafast pump/probe spectroscopy (<1 ps) in condensed matter 75.47.Lx Magnetotransport phenomena in manganites 78.30.-j Infrared and Raman spectra (condensed matter) 78.40.Ha Visible and ultraviolet spectra of nonmetallic inorganics YEAR: 2009
KEYWORDS:	calcium compounds, charge-ordered states, exchange interactions (electron), high-speed optical techniques, Jahn-Teller effect, lattice dynamics, neodymium compounds, reflectivity

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