Optical evidence for transient photoinduced magnetization in La0.7Ca0.3MnO3

Pump-probe Kerr spectroscopy reveals evidence for transient photoinduced magnetization (PIM) near Tc in the colossally magnetoresistive manganite La0.7Ca0.3MnO3. For temperatures above Tc, the PIM signature reaches full strength at the field-driven magnetic phase transition, while below Tc it exhibits a magnetic activation threshold of ~0.5 T. We compare the temperature dependence of the effect with diffuse spin scattering previously measured with neutrons and discuss these findings in the context of phase separation near Tc. Comments Copyright American Physical Society. Reprinted from Physical Review B, Volume 71, Issue 7, Article 075117, February 2005, 5 pages. Publisher URL: http://dx.doi.org/10.1103/PhysRevB.71.075117 Author(s) S. A. McGill, R. I. Miller, O. N. Torrens, Alexander Mamchik, I-Wei Chen, and J. M. Kikkawa This journal article is available at ScholarlyCommons: http://repository.upenn.edu/mse_papers/70 Optical evidence for transient photoinduced magnetization in La0.7Ca0.3MnO3 S. A. McGill,1 R. I. Miller,1 O. N. Torrens,1 A. Mamchik,2 I-Wei Chen,2 and J. M. Kikkawa1 1Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA 2Department of Materials Science & Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA sReceived 23 April 2004; revised manuscript received 19 August 2004; published 24 February 2005d Pump-probe Kerr spectroscopy reveals evidence for transient photoinduced magnetization sPIMd near Tc in the colossally magnetoresistive manganite La0.7Ca0.3MnO3. For temperatures above Tc, the PIM signature reaches full strength at the field-driven magnetic phase transition, while below Tc it exhibits a magnetic activation threshold of ,0.5 T. We compare the temperature dependence of the effect with diffuse spin scattering previously measured with neutrons and discuss these findings in the context of phase separation near