Investigation of Phonon Anomaly in the Orbital Order State of La1-xSrxMnO3 (x ∼ 1/8)

Akira Takazawa, Hiroyuki Nojiri, Keigo Nagasaka, Kazuma Hirota, Yasuo Endoh

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Drastic changes have been observed in the temperature and doping dependence of the phonon spectra in La1-xSrxMnO3 with x = 0.10-0.125. For the x = 0.11 and 0.125 samples, some of the bending (Mn-O-Mn bond angle modulation) modes show broadening and softening in the ferromagnetic metallic phase, which appears in intermediate temperature range. In the low-temperature orbital-ordered phase, these bending modes become sharper and the temperature dependence of the oscillator strength coincides with that of the orbital ordering order-parameter directly determined by resonant X-ray scattering. These facts indicate a strong correlation between the bending-type lattice distortion and the orbital ordering in the low temperature phase. For x = 0.10, the phonon spectrum shows similarity with that of the end material LaMnO3 and no clear temperature dependence is found. The x-dependence of the phonon spectra is consistent with the existence of vertical phase boundary around x = 0.11 newly discovered by a recent X-ray powder diffraction study.

Original languageEnglish
Pages (from-to)902-910
Number of pages9
Journaljournal of the physical society of japan
Volume70
Issue number3
DOIs
Publication statusPublished - 2001 Mar 1

Keywords

  • Colossal magneto-resistance
  • Far-infrared spectroscopy
  • Orbital ordering
  • Phonon

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Investigation of Phonon Anomaly in the Orbital Order State of La<sub>1-x</sub>Sr<sub>x</sub>MnO<sub>3</sub> (x ∼ 1/8)'. Together they form a unique fingerprint.

Cite this