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27 April 2024

» pubmed » pmid12484847

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Ising quantum Hall ferromagnet in magnetically doped quantum wells
J Jaroszy?ski ; T Andrearczyk ; G Karczewski ; J Wróbel ; T Wojtowicz ; E Papis ; E Kami?ska ; A Piotrowska ; Dragana Popovi? ; T Dietl ;
Date:	23 Dec 2002
Journal:	Phys Rev Lett, 89 (26), 266802
Abstract:	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-->T(C) corroborates theoretical suggestions that the ferromagnet is destroyed by domain excitations.
Source:	PubMed, pmid12484847
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