Ultrafast optical pump terahertz-probe spectroscopy of strongly correlated electron materials.

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We have used optical-pump far-infrared probe spectroscopy to probe the low energy electron dynamics of high temperature superconductors and colossal magnetoresistance manganites. For the superconductor YBa2Cu3O7, picosecond conductivity measurements probe the interplay between Cooper-pairs and quasiparticles. In optimally doped films, the recovery time for long-range phase-coherent pairing increases from {approx}1.5 ps at 4K to {approx}3.5 ps near Tc, consistent with the closing of the superconducting gap. For underdoped films, the measured recovery time is temperature independent (3.5 ps) in accordance with the presence of a pseudogap. Ultrafast picosecond measurements of optically induced changes in the absolute conductivity of La0:7M0:3MnO3 thin ... continued below

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8 p.

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Averitt, R. D. (Richard D.); Taylor, Antoinette J.,; Thorsmølle, V. K. (Verner K.); Jia, Quanxi; Lobad, A. I. & Trugman, S. A. (Stuart A.) January 1, 2001.

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We have used optical-pump far-infrared probe spectroscopy to probe the low energy electron dynamics of high temperature superconductors and colossal magnetoresistance manganites. For the superconductor YBa2Cu3O7, picosecond conductivity measurements probe the interplay between Cooper-pairs and quasiparticles. In optimally doped films, the recovery time for long-range phase-coherent pairing increases from {approx}1.5 ps at 4K to {approx}3.5 ps near Tc, consistent with the closing of the superconducting gap. For underdoped films, the measured recovery time is temperature independent (3.5 ps) in accordance with the presence of a pseudogap. Ultrafast picosecond measurements of optically induced changes in the absolute conductivity of La0:7M0:3MnO3 thin films (M = Ca, Sr) from 10K to {approx}0.9Tc reveal a two-component relaxation. A fast, {approx}2 ps, conductivity decrease arises from optically induced modification of the effective phonon temperature. The slower component, related to spin-lattice relaxation, has a lifetime that increases upon approaching Tc from below in accordance with an increasing spin specific heat. Our results indicate that for T<<Tc, the conductivity is determined by incoherent phonons while spin fluctuations dominate near Tc.

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8 p.

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  • "Submitted to: Invited paper for Proceedings of the 26th International Conference on Infrared and Millimeter Waves"

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  • Report No.: LA-UR-01-4821
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 975709
  • Archival Resource Key: ark:/67531/metadc935517

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 2001

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 1:42 p.m.

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Averitt, R. D. (Richard D.); Taylor, Antoinette J.,; Thorsmølle, V. K. (Verner K.); Jia, Quanxi; Lobad, A. I. & Trugman, S. A. (Stuart A.). Ultrafast optical pump terahertz-probe spectroscopy of strongly correlated electron materials., article, January 1, 2001; United States. (digital.library.unt.edu/ark:/67531/metadc935517/: accessed April 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.