Europhys. Lett.
Volume 70, Number 3, May 2005
Page(s) 383 - 389
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 06 April 2005
Europhys. Lett., 70 (3), pp. 383-389 (2005)
DOI: 10.1209/epl/i2005-10007-5

Dynamical reordering of charge stripes in $\chem{(Bi,Ca)MnO_3}$ driven by electron beam irradiation

Y. Horibe1, C. H. Chen2, 3, S.-W. Cheong4 and S. Mori1

1  Department of Materials Science, CIAS, Osaka Prefecture University - Osaka, Japan
2  Center for Condensed Matter Sciences and Department of Physics National Taiwan University - Taipei 106, Taiwan, ROC
3  Institute of Atomic and Molecular Sciences and Institute of Physics Academia Sinica - Taipei 106, Taiwan, ROC
4  Department of Physics and Astronomy, Rutgers University Piscataway, NJ 08854, USA

received 7 January 2005; accepted in final form 18 March 2005
published online 6 April 2005

Under the irradiation of a high-energy electron beam in a transmission electron microscope, we find that the charge ordering in $\chem{(Bi,Ca)MnO_3}$ is first destroyed and then dynamically reordered with a further increase of the electron beam intensity. This electron beam-induced melting and re-entrant behavior of charge ordering are found to be a reversible process as a function of the beam intensity. The non-equilibrium behaviors occur as a result of the dynamical reordering as the external drive intensifies. Our finding resembles the dynamics of driven elastic media in the presence of quenched disorder and an external applied drive such as the dynamic reordering of a vortex lattice driven by an external electric current. The energetics of the electron beam-induced effect is also discussed in the framework of the lifetime of the charge disordered clusters induced by the external irradiation.

75.47.Lx - Manganites.
61.14.-x - Electron diffraction and scattering.
64.60.Cn - Order-disorder transformations; statistical mechanics of model systems.

© EDP Sciences 2005