Magnetic susceptibility of diluted magnetic (semimagnetic) semiconductors: Further evidence for superexchange

Abstract

%'e analyze the high-temperature magnetic-susceptibility data for Zn& "Mn"Se, together with new results for the quaternary systems Hg& "~Mn"Cd~Te and Hg& "~Mn"Zn~Te. This analysis provides unambiguous new evidence that superexchange interaction via anions (Te,Se) is the dominant mechanism of d-d coupling in A l' "Mn"8 ' alloys. %e also discuss briefly the relationship between the high-and low-temperature magnetic properties of these systems.

Crystal-field investigations and magnetic properties ofNd3+-dopedBi4<

“…Usually, these interactions are caused by the superexchange interaction mediated via the anions. [7][8][9][10][11][12][13][14] The purpose of this paper is to study the magnetization, crystal-field effects, and EPR properties of Nd 3+ doped in Bi 4͑1−x͒ Nd 4x Si 3 O 12 (x = 0.5%, 1.5%, 2.5%, 3.5%, and 5%).…”

Crystal growth and magnetic properties of tin selenide-doped europium Sn1−xEuxSe

“…The exchange interaction between Co 2 + ions in II-VI compounds was determined by magnetic-susceptibility and Raman-scattering measurements. This interaction is antiferromagnetic in nature, its value being J P /k B Z35 K [14][15][16]. On the other hand, magneticsusceptibility measurements on a Sn 1 À x Eu x Te sample exhibited a weak antiferromagnetic coupling between Eu 2 + ions [17,18], in good agreement with the magnetization and magnetic-susceptibility measurements of Anderson et al [13] and those of Savage and Rhyne [19] on Pb 1 À x Gd x Te, indicating a small antiferromagnetic exchange interaction between the Gd 3 + ions.…”

“…The magnetization of the sample due to these ions is given by the Brillouin function, modified by an exchange interaction between the probe ions. Usually, these interactions are caused by the superexchange interaction mediated via the anions [7][8][9][10][11][12][13][14]. The exchange interaction between Co 2 + ions in II-VI compounds was determined by magnetic-susceptibility and Raman-scattering measurements.…”

Monte Carlo simulation of Heisenberg spin glass on FCC lattice in external magnetic field

“…The next nearest neighbour (NNN) and more distant interactions are weaker and decrease very rapidly with distance between the Mn ions [3]. The value of J~NW is not well known and is believed to be in range 0.1-0.25 of the NN exchange constant [4][5][6].The fcc lattice with AF couplings does not allow to simultaneous minimization of energies of all exchange bonds and thus leads to frustration. Randomness and frustration are two essential factors thought to be respgnsible for the spin-glass behaviour observed experimentally in SMSC [7].…”

“…The next nearest neighbour (NNN) and more distant interactions are weaker and decrease very rapidly with distance between the Mn ions [3]. The value of J~NW is not well known and is believed to be in range 0.1-0.25 of the NN exchange constant [4][5][6].…”