Time-resolved optical studies of spin and quasiparticle dynamics in colossal magnetoresistance materials: La0.67 Ca0.33 MnO3, La0.67 Sr0.33 MnO3, and Sr2 FeMoO6

Y. H. Ren, M. Ebrahim, H. B. Zhao, G. Lüpke, Z. A. Xu, V. Adyam, Qi Li

Research output: Contribution to journalArticle

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Abstract

We report on transient reflectivity and magneto-optical Kerr measurements from the colossal magnetoresistance compounds La0.67 Ca0.33 MnO3 (LCMO), La0.67 Sr0.33 MnO3 (LSMO), and Sr2 FeMoO6 (SFMO) as a function of temperature and magnetic field. In LCMO and LSMO, an unusually slow (∼1 μs) carrier relaxation component is revealed in the transient reflectivity traces. The component disappears as the transition temperature is approached from below. This slow decay process is attributed to spin-lattice relaxation of carriers in localized states and shows a close relationship with the spectral weight near the Fermi surface. The attribution is further supported by our pump-probe magneto-optical Kerr measurements. In addition to the clear observation of magnetic precessions, a long-lived exponentially decaying background reflects the spin-related relaxation of photoexcited electrons. In contrast to manganites, the temperature dependence of transient reflectivity is negligible, although there is a significant change in transient Kerr rotation in SFMO. Our results show that the dynamics of charge, spin, and lattice are strongly correlated with each other in the manganites, but the spin degree of freedom is thermally insulated from the electron and lattice systems.

Original languageEnglish (US)
Article number014408
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number1
DOIs
StatePublished - Jul 7 2008

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Colossal magnetoresistance
spin dynamics
reflectance
Manganites
precession
spin-lattice relaxation
Fermi surfaces
Spin-lattice relaxation
Fermi surface
Electrons
temperature distribution
electrons
degrees of freedom
transition temperature
pumps
Superconducting transition temperature
temperature dependence
Temperature distribution
probes
Pumps

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Time-resolved optical studies of spin and quasiparticle dynamics in colossal magnetoresistance materials: La0.67 Ca0.33 MnO3, La0.67 Sr0.33 MnO3, and Sr2 FeMoO6",
abstract = "We report on transient reflectivity and magneto-optical Kerr measurements from the colossal magnetoresistance compounds La0.67 Ca0.33 MnO3 (LCMO), La0.67 Sr0.33 MnO3 (LSMO), and Sr2 FeMoO6 (SFMO) as a function of temperature and magnetic field. In LCMO and LSMO, an unusually slow (∼1 μs) carrier relaxation component is revealed in the transient reflectivity traces. The component disappears as the transition temperature is approached from below. This slow decay process is attributed to spin-lattice relaxation of carriers in localized states and shows a close relationship with the spectral weight near the Fermi surface. The attribution is further supported by our pump-probe magneto-optical Kerr measurements. In addition to the clear observation of magnetic precessions, a long-lived exponentially decaying background reflects the spin-related relaxation of photoexcited electrons. In contrast to manganites, the temperature dependence of transient reflectivity is negligible, although there is a significant change in transient Kerr rotation in SFMO. Our results show that the dynamics of charge, spin, and lattice are strongly correlated with each other in the manganites, but the spin degree of freedom is thermally insulated from the electron and lattice systems.",
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Time-resolved optical studies of spin and quasiparticle dynamics in colossal magnetoresistance materials : La0.67 Ca0.33 MnO3, La0.67 Sr0.33 MnO3, and Sr2 FeMoO6. / Ren, Y. H.; Ebrahim, M.; Zhao, H. B.; Lüpke, G.; Xu, Z. A.; Adyam, V.; Li, Qi.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 78, No. 1, 014408, 07.07.2008.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Time-resolved optical studies of spin and quasiparticle dynamics in colossal magnetoresistance materials

T2 - La0.67 Ca0.33 MnO3, La0.67 Sr0.33 MnO3, and Sr2 FeMoO6

AU - Ren, Y. H.

AU - Ebrahim, M.

AU - Zhao, H. B.

AU - Lüpke, G.

AU - Xu, Z. A.

AU - Adyam, V.

AU - Li, Qi

PY - 2008/7/7

Y1 - 2008/7/7

N2 - We report on transient reflectivity and magneto-optical Kerr measurements from the colossal magnetoresistance compounds La0.67 Ca0.33 MnO3 (LCMO), La0.67 Sr0.33 MnO3 (LSMO), and Sr2 FeMoO6 (SFMO) as a function of temperature and magnetic field. In LCMO and LSMO, an unusually slow (∼1 μs) carrier relaxation component is revealed in the transient reflectivity traces. The component disappears as the transition temperature is approached from below. This slow decay process is attributed to spin-lattice relaxation of carriers in localized states and shows a close relationship with the spectral weight near the Fermi surface. The attribution is further supported by our pump-probe magneto-optical Kerr measurements. In addition to the clear observation of magnetic precessions, a long-lived exponentially decaying background reflects the spin-related relaxation of photoexcited electrons. In contrast to manganites, the temperature dependence of transient reflectivity is negligible, although there is a significant change in transient Kerr rotation in SFMO. Our results show that the dynamics of charge, spin, and lattice are strongly correlated with each other in the manganites, but the spin degree of freedom is thermally insulated from the electron and lattice systems.

AB - We report on transient reflectivity and magneto-optical Kerr measurements from the colossal magnetoresistance compounds La0.67 Ca0.33 MnO3 (LCMO), La0.67 Sr0.33 MnO3 (LSMO), and Sr2 FeMoO6 (SFMO) as a function of temperature and magnetic field. In LCMO and LSMO, an unusually slow (∼1 μs) carrier relaxation component is revealed in the transient reflectivity traces. The component disappears as the transition temperature is approached from below. This slow decay process is attributed to spin-lattice relaxation of carriers in localized states and shows a close relationship with the spectral weight near the Fermi surface. The attribution is further supported by our pump-probe magneto-optical Kerr measurements. In addition to the clear observation of magnetic precessions, a long-lived exponentially decaying background reflects the spin-related relaxation of photoexcited electrons. In contrast to manganites, the temperature dependence of transient reflectivity is negligible, although there is a significant change in transient Kerr rotation in SFMO. Our results show that the dynamics of charge, spin, and lattice are strongly correlated with each other in the manganites, but the spin degree of freedom is thermally insulated from the electron and lattice systems.

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