"Ultrafast x-ray and optical signatures of phase competition and separation underlying the photoinduced metallic phase in Pr1−x Cax MnO3 "

M. C. Langner: S. Zhou, G. Coslovich, Y.-D. Chuang, Y. Zhu, J. S. Robinson, W. F. Schlotter, J. J. Turner, M. P. Minitti, R. G. Moore, W. S. Lee, D. H. Lu, D. Doering, P. Denes, Y. Tomioka, Y. Tokura, R. A. Kaindl, and R. W. Schoenlein; Physical Review B, 10/29/15.

Additional Authors: S. Zhou, G. Coslovich, Y.-D. Chuang, Y. Zhu, J. S. Robinson, W. F. Schlotter, J. J. Turner, M. P. Minitti, R. G. Moore, W. S. Lee, D. H. Lu, D. Doering, P. Denes, Y. Tomioka, Y. Tokura, R. A. Kaindl, and R. W. Schoenlein

Abstract:

The coexistence of ferromagnetic and antiferromagnetic phases and their role in the photoinduced insulator-to-metal transition in Pr1x Cax MnO3 are revealed via ultrafast resonant x-ray diffraction and broadband optical reflectivity measurements. The antiferromagnetic scattering signal and ferromagnetically sensitive reflectivity measurements show similar, strongly temperature dependent time scales. We attribute the common dynamics to an activation barrier between the equilibrium insulating phase and the photoinduced metallic phase related to interactions between the phase-separated ferromagnetic and antiferromagnetic insulating phases.