Picosecond dynamics of the spin-lattice relaxation in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">La</mi></mrow><mrow><mn>0.7</mn></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">Ca</mi></mrow><mrow><mn>0.2</mn></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">MnO</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow><mo>:</mo></math></span> Magnetic-field dependence

Ahmed I. Lobad; Richard D. Averitt; Antoinette J. Taylor

doi:10.1103/PhysRevB.63.060410

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Picosecond dynamics of the spin-lattice relaxation in ${La}_{0.7} {Ca}_{0.2} {MnO}_{3} :$ Magnetic-field dependence

Ahmed I. Lobad, Richard D. Averitt, and Antoinette J. Taylor

Phys. Rev. B 63, 060410(R) – Published 23 January 2001

Abstract

We have employed ultrafast optical pump-probe measurements at 1.5 eV to study the picosecond dynamics of the magnetic-field-induced metal-insulator (MI) transition in ${La}_{0.7} {Ca}_{0.3} {MnO}_{3}$ thin films in fields up to 7 T. We show that field induced modification of the photoinduced dynamic spectral weight transfer (DSWT) is related to changes in the magnetic entropy. The magnetic-field-induced increase of the ferromagnetic-paramagnetic transition temperature is evident in the spin-lattice relaxation time and amplitude scaling of the DSWT.

Received 18 September 2000

DOI:https://doi.org/10.1103/PhysRevB.63.060410

Authors & Affiliations

Ahmed I. Lobad^*, Richard D. Averitt, and Antoinette J. Taylor

Materials Science and Technology, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

^*Present address: Kirtland AFB-DELS, Albuquerque, NM 87117.

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Vol. 63, Iss. 6 — 1 February 2001

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