Critical Resistance of the Quantum Hall Ferromagnet in AlAs 2D Electrons

Details Critical Resistance of the Quantum Hall Ferromagnet in AlAs 2D Electrons Critical Resistance of the Quantum Hall Ferromagnet in AlAs 2D Electrons

2003-04-23

arxiv.org/abs/cond-mat/0304507v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Added a figure & minor corrections to text; to appear in Phys. Rev. Lett

Scientific paper

Magnetic transitions in AlAs two-dimensional electrons give rise to sharp resistance spikes within the quantum Hall effect. Such spikes are likely caused by carrier scattering at magnetic domain walls below the Curie temperature. We report a critical behavior in the temperature dependence of the spike width and amplitude, from which we deduce the Curie temperature of the quantum Hall ferromagnet. Our data also reveal that the Curie temperature increases monotonically with carrier density.

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