title: Ising quantum Hall ferromagnet in magnetically doped quantum wells.
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.
authors.affiliation: Institute of Physics, Polish Academy of Sciences, aleja Lotników 32/46, 02-668 Warszawa, Poland. jaroszy@magnet.fsu.edu
authors.forename: J
authors.initials: J
authors.lastname: Jaroszyński
authors.forename: T
authors.initials: T
authors.lastname: Andrearczyk
authors.forename: G
authors.initials: G
authors.lastname: Karczewski
authors.forename: J
authors.initials: J
authors.lastname: Wróbel
authors.forename: T
authors.initials: T
authors.lastname: Wojtowicz
authors.forename: E
authors.initials: E
authors.lastname: Papis
authors.forename: E
authors.initials: E
authors.lastname: Kamińska
authors.forename: A
authors.initials: A
authors.lastname: Piotrowska
authors.forename: Dragana
authors.initials: D
authors.lastname: Popović
authors.forename: T
authors.initials: T
authors.lastname: Dietl