Title :
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
Abstract :
Ultrafast IR pump-probe spectroscopy is used to investigate La1/4Pr3/8Ca3/8MnO3 (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; La0.25Pr0.375Ca0.375MnO3; 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;
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
DOI :
10.1109/ICIMW.2009.5325552
