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Titolo:
Investigation of phonon anomaly in the orbital order state of La1-xSrxMnO3(x similar to 1/8)
Autore:
Takazawa, A; Nojiri, H; Nagasaka, K; Hirota, K; Endoh, Y;
Indirizzi:
Sci Univ Tokyo, Fac Sci, Dept Phys, Shinjuku Ku, Tokyo 1628601, Japan Sci Univ Tokyo Tokyo Japan 1628601 ys, Shinjuku Ku, Tokyo 1628601, Japan Tohoku Univ, Inst Mat Res, CREST, Sendai, Miyagi 9808577, Japan Tohoku Univ Sendai Miyagi Japan 9808577 ST, Sendai, Miyagi 9808577, Japan Tohoku Univ, Dept Phys, CREST, Sendai, Miyagi 9808578, Japan Tohoku Univ Sendai Miyagi Japan 9808578 ST, Sendai, Miyagi 9808578, Japan
Titolo Testata:
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
fascicolo: 3, volume: 70, anno: 2001,
pagine: 902 - 910
SICI:
0031-9015(200103)70:3<902:IOPAIT>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
DOUBLE-EXCHANGE; MAGNETIC-FIELD; PHASE-DIAGRAM; TRANSITION; LAMNO3; MAGNETORESISTANCE; REFLECTIVITY; RESISTIVITY; SCATTERING; SPECTRA;
Keywords:
colossal magneto-resistance; phonon; far-infrared spectroscopy; orbital ordering;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Takazawa, A Sci Univ Tokyo, Fac Sci, Dept Phys, Shinjuku Ku, 1-3 Kagurazaka, Tokyo 1628601, Japan Sci Univ Tokyo 1-3 Kagurazaka Tokyo Japan 1628601 8601, Japan
Citazione:
A. Takazawa et al., "Investigation of phonon anomaly in the orbital order state of La1-xSrxMnO3(x similar to 1/8)", J PHYS JPN, 70(3), 2001, pp. 902-910

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. Thesefacts 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 phononspectra is consistent with the existence of vertical phase boundary aroundx = 0.11 newly discovered by a recent X-ray powder diffraction study.

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Documento generato il 07/07/20 alle ore 12:52:35