Probing charge/orbital correlation in La1.2Sr1.8Mn2O7 by Raman spectroscopy

Ki Ichi Yamamoto, Tsuyoshi Kimura, Tadahiko Ishikawa, Takuro Katsufuji, Yoshinori Tokura

研究成果: Article

19 引用 (Scopus)

抄録

Raman spectra have been investigated for a single crystal of La1.2Sr1.8Mn2O7 that shows colossal magnetoresistance around the Curie temperature Tc = 126K. Several broad phonon peaks grow with decrease of temperature down to TC but disappear below TC, which can be clearly ascribed to a change in the charge/orbital correlation by comparison with the spectra for the charge/orbital ordered states of the layered manganites (La0.5Sr1.5MnO4 and LaSr2Mn2O7). Such a real-space charge density fluctuation is also observed to cause the low-energy diffuse Raman response, the B1g component of which is critically suppressed below TC as well.

元の言語English
ページ(範囲)2538-2541
ページ数4
ジャーナルJournal of the Physical Society of Japan
68
発行部数8
出版物ステータスPublished - 1999 8
外部発表Yes

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Raman spectroscopy
orbitals
Curie temperature
space charge
Raman spectra
causes
single crystals
temperature
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

これを引用

Probing charge/orbital correlation in La1.2Sr1.8Mn2O7 by Raman spectroscopy. / Yamamoto, Ki Ichi; Kimura, Tsuyoshi; Ishikawa, Tadahiko; Katsufuji, Takuro; Tokura, Yoshinori.

:: Journal of the Physical Society of Japan, 巻 68, 番号 8, 08.1999, p. 2538-2541.

研究成果: Article

Yamamoto, KI, Kimura, T, Ishikawa, T, Katsufuji, T & Tokura, Y 1999, 'Probing charge/orbital correlation in La1.2Sr1.8Mn2O7 by Raman spectroscopy', Journal of the Physical Society of Japan, 巻. 68, 番号 8, pp. 2538-2541.
Yamamoto, Ki Ichi ; Kimura, Tsuyoshi ; Ishikawa, Tadahiko ; Katsufuji, Takuro ; Tokura, Yoshinori. / Probing charge/orbital correlation in La1.2Sr1.8Mn2O7 by Raman spectroscopy. :: Journal of the Physical Society of Japan. 1999 ; 巻 68, 番号 8. pp. 2538-2541.
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T1 - Probing charge/orbital correlation in La1.2Sr1.8Mn2O7 by Raman spectroscopy

AU - Yamamoto, Ki Ichi

AU - Kimura, Tsuyoshi

AU - Ishikawa, Tadahiko

AU - Katsufuji, Takuro

AU - Tokura, Yoshinori

PY - 1999/8

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N2 - Raman spectra have been investigated for a single crystal of La1.2Sr1.8Mn2O7 that shows colossal magnetoresistance around the Curie temperature Tc = 126K. Several broad phonon peaks grow with decrease of temperature down to TC but disappear below TC, which can be clearly ascribed to a change in the charge/orbital correlation by comparison with the spectra for the charge/orbital ordered states of the layered manganites (La0.5Sr1.5MnO4 and LaSr2Mn2O7). Such a real-space charge density fluctuation is also observed to cause the low-energy diffuse Raman response, the B1g component of which is critically suppressed below TC as well.

AB - Raman spectra have been investigated for a single crystal of La1.2Sr1.8Mn2O7 that shows colossal magnetoresistance around the Curie temperature Tc = 126K. Several broad phonon peaks grow with decrease of temperature down to TC but disappear below TC, which can be clearly ascribed to a change in the charge/orbital correlation by comparison with the spectra for the charge/orbital ordered states of the layered manganites (La0.5Sr1.5MnO4 and LaSr2Mn2O7). Such a real-space charge density fluctuation is also observed to cause the low-energy diffuse Raman response, the B1g component of which is critically suppressed below TC as well.

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KW - Colossal magnetoresistance (CMR)

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KW - Raman scattering

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