TY - JOUR
T1 - Temperature-Dependent Raman Scattering of Multiferroic Pb(Fe1/2Nb1/2)O3
AU - García-Flores, A. F.
AU - Tenne, Dmitri A.
AU - Choi, Y. J.
AU - Ren, W. J.
AU - Xi, X. X.
AU - Cheong, S. W.
PY - 2011/1/12
Y1 - 2011/1/12
N2 - Raman scattering measurements on multiferroic Pb(Fe 1/2 Nb 1/2 )O 3 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 B O 6 units revealed an anomalous frequency shift below T N ~ 143 K. These anomalous deviations at T N 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 * .
AB - Raman scattering measurements on multiferroic Pb(Fe 1/2 Nb 1/2 )O 3 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 B O 6 units revealed an anomalous frequency shift below T N ~ 143 K. These anomalous deviations at T N 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 * .
UR - https://scholarworks.boisestate.edu/physics_facpubs/46
UR - http://dx.doi.org/10.1088/0953-8984/23/1/015401
U2 - 10.1088/0953-8984/23/1/015401
DO - 10.1088/0953-8984/23/1/015401
M3 - Article
JO - Physics Faculty Publications and Presentations
JF - Physics Faculty Publications and Presentations
ER -