Long-wavelength magnetic excitations in multiferroic BiFeO3

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Colossal magnetoresistance manganites have been subjected to extensive research due to their unique magnetic and electrical properties. The physical origin of this phenomenon has been attributed to the double-exchange model. However, this double-exchange mechanism of carriers between Mn{sup 2+} and Mn{sup 3+} ions alone cannot account for all the observed changes such as metal-insulator transition in these materials. Other factors include the highly correlated nature of the spin, lattice, charge and orbital degrees of freedom. Ultrafast optical techniques are powerful probes for investigating the quasi-particle and spin relaxation dynamics in these strongly correlated systems. Recently, Zhao et. al. reported a ... continued below

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Talbayev, Diyar & Taylor, Antoinette J January 1, 2008.

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Colossal magnetoresistance manganites have been subjected to extensive research due to their unique magnetic and electrical properties. The physical origin of this phenomenon has been attributed to the double-exchange model. However, this double-exchange mechanism of carriers between Mn{sup 2+} and Mn{sup 3+} ions alone cannot account for all the observed changes such as metal-insulator transition in these materials. Other factors include the highly correlated nature of the spin, lattice, charge and orbital degrees of freedom. Ultrafast optical techniques are powerful probes for investigating the quasi-particle and spin relaxation dynamics in these strongly correlated systems. Recently, Zhao et. al. reported a re-entrant metal insulator (M-I) transition in single crystals of Cu-doped manganites La{sub 1-x}Pb{sub x}MnO{sub 3} (x = 0.14). The re-entrant M-I transition at low temperatures was observed in samples with Cu-doping (y {>=} 0.02) and was attributed to the charge carrier localization due to lattice distortion caused by Cu doping at Mn sites. However, there have been no reports on the effects of Cu-doping on the spin-lattice interaction in these materials. In this work, we investigate the spin-lattice relaxation and photo-induced magnetization dynamics in single crystals of La{sub 1-x}Pb{sub x}Mn{sub 1-y-z}Cu{sub y}O{sub 3} (x = 0.14, y = 0,0.01,0.02,0.04,0.06 and z = 0.02, 0.08, 0.11, 0.17, 0.20) that were grown by the flux melt technique. The substitution of Mn sites with a transitional element Cu allows one to study the critical role of Mn ions in CMR materials. Transient reflection spectroscopy and time-resolved magnetooptkal kerr spectroscopy have been employed to probe the quasi-particle relaxation and the photo-induced dynamics of magnetization. Through comparing these results, the charge and spin dynamics were independently investigated. The origins of the re-entrant M-I transition in this novel system were also discussed in light of these new findings.

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  • 2009 Spring Meeting of the Materials research Society ; April 13, 2009 ; San Francisco, CA

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  • Report No.: LA-UR-08-07804
  • Report No.: LA-UR-08-7804
  • Grant Number: AC52-06NA25396
  • Office of Scientific & Technical Information Report Number: 956619
  • Archival Resource Key: ark:/67531/metadc932259

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  • January 1, 2008

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 12:18 p.m.

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Talbayev, Diyar & Taylor, Antoinette J. Long-wavelength magnetic excitations in multiferroic BiFeO3, article, January 1, 2008; [New Mexico]. (digital.library.unt.edu/ark:/67531/metadc932259/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.