IR pump-probe study of phase separated hole-doped manganite, La1/4Pr3/8Ca3/8MnO3

Author

Jang, Kyu-Jin ; Lim, Jungyoul ; Ahn, Jeongseob ; Kim, Jung-Ho ; Yee, K.-J. ; Ahn, J.S.

Author_Institution

KAIST, Daejeon, South Korea

fYear

2009

fDate

21-25 Sept. 2009

Firstpage

1

Lastpage

2

Abstract

Ultrafast IR pump-probe spectroscopy is used to investigate La_1/4Pr_3/8Ca_3/8MnO₃ (LPCMO). Two types of coherent phonons strongly coupled with charge-ordering (CO) phase are observed. Temperature dependences of coherent phonons are explained by a hypothesis related with CO gap opening. According to the hypothesis, photo-induced electrons relax to acoustic phonon in the paramagnetic phase, but to optical phonons in the CO phase.

Keywords

calcium compounds; doping; high-speed optical techniques; infrared spectra; lanthanum compounds; paramagnetic materials; phase separation; phonons; praseodymium compounds; La_0.25Pr_0.375Ca_0.375MnO₃; acoustic phonon; charge-ordering phase; coherent phonons; doping; optical phonons; paramagnetic phase; phase separation; photo-induced electrons; temperature dependency; ultrafast IR pump-probe spectra; Acoustic beams; Optical pulses; Optical pumping; Optical scattering; Phonons; Probes; Reflectivity; Spectroscopy; Temperature dependence; Ultrafast optics;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared, Millimeter, and Terahertz Waves, 2009. IRMMW-THz 2009. 34th International Conference on

Conference_Location

Busan

Print_ISBN

978-1-4244-5416-7

Electronic_ISBN

978-1-4244-5417-4

Type

conf

DOI

10.1109/ICIMW.2009.5325552

Filename

5325552