Ising Quantum Hall Ferromagnet in Magnetically Doped Quantum Wells

Details Ising Quantum Hall Ferromagnet in Magnetically Doped Quantum Wells Ising Quantum Hall Ferromagnet in Magnetically Doped Quantum Wells

2002-05-14

arxiv.org/abs/cond-mat/0205296v3

Phys. Rev. Lett. 89, 266802, (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

revised, 4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.89.266802

We report on the observation of the Ising quantum Hall ferromagnet with Curie temperature $T_C$ 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 $T \to T_C$ corroborates theoretical suggestions that the ferromagnet is destroyed by domain excitations.

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