2002/05/31 by J. Jaroszynski, T. Andrearczyk, G. Karczewski +7 · 1 citation
Physics and Astronomy · #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.89.266802
published as Phys. Rev. Lett. 89, 266802, (2002) · revised, 4 pages, 4 figures
arxiv created 2002/12/12 · arxiv updated 2009/11/30
We report on the observation of the Ising quantum Hall ferromagnet with Curie temperature TC as high as 2 K in a modulation-doped (Cd,Mn)Te heterostructure. In this system field-induced crossing of Landau levels occurs due to the giant spin-splitting effect. Magnetoresistance data, collected over a wide range of temperatures, magnetic fields, tilt angles, and electron densities, are discussed taking into account both Coulomb electron-electron interactions and s-d coupling to Mn spin fluctuations. The critical behavior of the resistance ``spikes'' at T → TC corroborates theoretical suggestions that the ferromagnet is destroyed by domain excitations.