Article abstract
Nature Materials 5, 881 - 886 (2006)
Published online: 8 October 2006 | doi:10.1038/nmat1743
Subject Categories: Ceramics | Magnetic materials | Surface and thin films
Magnetic imaging of a supercooling glass transition in a weakly disordered ferromagnet
Weida Wu1,2, Casey Israel1, Namjung Hur2,3, Soonyong Park2, Sang-Wook Cheong2 & Alex de Lozanne1
Abstract
Spin glasses are founded in the frustration and randomness of microscopic magnetic interactions. They are non-ergodic systems where replica symmetry is broken. Although magnetic glassy behaviour has been observed in many colossal magnetoresistive manganites, there is no consensus that they are spin glasses. Here, an intriguing glass transition in (La,Pr,Ca)MnO3 is imaged using a variable-temperature magnetic force microscope. In contrast to the speculated spin-glass picture, our results show that the observed static magnetic configuration seen below the glass-transition temperature arises from the cooperative freezing of the first-order antiferromagnetic (charge ordered) to ferromagnetic transition. Our data also suggest that accommodation strain is important in the kinetics of the phase transition. This cooperative freezing idea has been applied to structural glasses including window glasses and supercooled liquids, and may be applicable across many systems to any first-order phase transition occurring on a complex free-energy landscape.
- Department of Physics, University of Texas, Austin, Texas 78712, USA
- Department of Physics and Astronomy and Rutgers Center for Emergent Materials, Rutgers University, Piscataway, New Jersey 08854, USA
- Present address: Department of Physics, Inha University, Incheon 402751, South Korea
Correspondence to: Alex de Lozanne1 e-mail: delozanne@physics.utexas.edu
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