Temperature-dependent Raman scattering of multiferroic Pb(Fe 1/2Nb1/2)O3

A. F. García-Flores, D. A. Tenne, Young Jai Choi, W. J. Ren, X. X. Xi, S. W. Cheong

Research output: Contribution to journalArticle

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Abstract

Raman scattering measurements on multiferroic Pb(Fe1/2Nb 1/2)O3 over a wide temperature range from 10 to 500 K were performed. Very broad and overlapping peaks (first-order character) and a prominent high-frequency peak at∼ 1130 cm-1, which we assign as a two-phonon peak, were observed. These features showed remarkable changes in their Raman scattering intensity and spectral shape at the characteristic temperature T*∼ 330 K, clearly showing a structural lattice change at around T*. The temperature dependence of some stretching vibration modes of the BO6 units revealed an anomalous frequency shift below Tn∼ 143 K. These anomalous deviations at Tn of the phonon frequency are associated with the spin-phonon coupling mechanism. Complementary magnetic data confirmed a weak magnetic ordering at room temperature and interestingly showed an anomaly at about T *. These results suggest an interplay between ferroelectric, structural and magnetic degrees of freedom in PFN, starting to be significant at around T*.

Original languageEnglish
Article number015401
JournalJournal of Physics Condensed Matter
Volume23
Issue number1
DOIs
Publication statusPublished - 2011 Jan 12

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Raman scattering
Raman spectra
Temperature
frequency shift
temperature
vibration mode
degrees of freedom
anomalies
Stretching
Ferroelectric materials
deviation
Magnetization
temperature dependence
room temperature

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Materials Science(all)

Cite this

García-Flores, A. F. ; Tenne, D. A. ; Choi, Young Jai ; Ren, W. J. ; Xi, X. X. ; Cheong, S. W. / Temperature-dependent Raman scattering of multiferroic Pb(Fe 1/2Nb1/2)O3. In: Journal of Physics Condensed Matter. 2011 ; Vol. 23, No. 1.
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abstract = "Raman scattering measurements on multiferroic Pb(Fe1/2Nb 1/2)O3 over a wide temperature range from 10 to 500 K were performed. Very broad and overlapping peaks (first-order character) and a prominent high-frequency peak at∼ 1130 cm-1, which we assign as a two-phonon peak, were observed. These features showed remarkable changes in their Raman scattering intensity and spectral shape at the characteristic temperature T*∼ 330 K, clearly showing a structural lattice change at around T*. The temperature dependence of some stretching vibration modes of the BO6 units revealed an anomalous frequency shift below Tn∼ 143 K. These anomalous deviations at Tn of the phonon frequency are associated with the spin-phonon coupling mechanism. Complementary magnetic data confirmed a weak magnetic ordering at room temperature and interestingly showed an anomaly at about T *. These results suggest an interplay between ferroelectric, structural and magnetic degrees of freedom in PFN, starting to be significant at around T*.",
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Temperature-dependent Raman scattering of multiferroic Pb(Fe 1/2Nb1/2)O3. / García-Flores, A. F.; Tenne, D. A.; Choi, Young Jai; Ren, W. J.; Xi, X. X.; Cheong, S. W.

In: Journal of Physics Condensed Matter, Vol. 23, No. 1, 015401, 12.01.2011.

Research output: Contribution to journalArticle

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AU - García-Flores, A. F.

AU - Tenne, D. A.

AU - Choi, Young Jai

AU - Ren, W. J.

AU - Xi, X. X.

AU - Cheong, S. W.

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AB - Raman scattering measurements on multiferroic Pb(Fe1/2Nb 1/2)O3 over a wide temperature range from 10 to 500 K were performed. Very broad and overlapping peaks (first-order character) and a prominent high-frequency peak at∼ 1130 cm-1, which we assign as a two-phonon peak, were observed. These features showed remarkable changes in their Raman scattering intensity and spectral shape at the characteristic temperature T*∼ 330 K, clearly showing a structural lattice change at around T*. The temperature dependence of some stretching vibration modes of the BO6 units revealed an anomalous frequency shift below Tn∼ 143 K. These anomalous deviations at Tn of the phonon frequency are associated with the spin-phonon coupling mechanism. Complementary magnetic data confirmed a weak magnetic ordering at room temperature and interestingly showed an anomaly at about T *. These results suggest an interplay between ferroelectric, structural and magnetic degrees of freedom in PFN, starting to be significant at around T*.

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