Optically detected spin-glass transition in superlattices and quantum wells of diluted magnetic semiconductors

1996 ◽  
Vol 159 (1-4) ◽  
pp. 1009-1013 ◽  
Author(s):  
M. Dahl ◽  
A. Mergler ◽  
M. Sawicki ◽  
T. Litz ◽  
A. Waag ◽  
...  
Keyword(s):  
Glass Transition ◽  
Quantum Wells ◽  
Spin Glass ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Spin Glass Transition ◽  
Diluted Magnetic ◽  
Optically Detected

scholarly journals Investigation of Spin-Glass Transition in Semimagnetic Quantum Wells Based on Cd1-xMnxTe by Means of Optical Spectroscopy

1997 ◽  
Vol 92 (5) ◽  
pp. 1075-1078 ◽  
Author(s):  
U. Zehnder ◽  
D.R. Yakovlev ◽  
W. Ossau ◽  
A. Waag ◽  
G. Landwehr ◽  
...  
Keyword(s):  
Glass Transition ◽  
Quantum Wells ◽  
Spin Glass ◽  
Optical Spectroscopy ◽  
Spin Glass Transition

Cluster spin-glasslike behavior in nanoparticles of diluted magnetic semiconductors ZnS:Mn

2007 ◽  
Vol 22 (9) ◽  
pp. 2376-2383 ◽  
Author(s):  
Zhen-Hua Wang ◽  
Dian-Yu Geng ◽  
Da Li ◽  
Zhi-Dong Zhang
Keyword(s):  
Spin Glass ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Ac Susceptibility ◽  
Spin Glass Behavior ◽  
Cluster Spin Glass ◽  
Real Concentration ◽  
Higher Temperature ◽  
Diluted Magnetic ◽  
Lower Temperature

Zn1−xMnxS nanoparticles with x = 0.08, 0.16, and 0.32 were synthesized by a coprecipitation reaction between nitrate and sodium sulfide at room temperature in air. The magnetic properties of the Zn1−xMnxS nanoparticles were investigated by alternating-current (ac) susceptibility and direct-current (dc) magnetization measurements. The Mn3O4 phase was observed to exist in the Zn1−xMnxS nanoparticles as x ⩾ 0.16. The actual concentrations (x) of Mn-doped ZnS nanoparticles were determined by energy-dispersive x-ray analysis (EDAX) to be 0.06, 0.11, and 0.20, respectively, corresponding to the initial concentrations x = 0.08, 0.16, and 0.32. All the nanoparticles had the cubic structure and the lattice constant of Zn1−xMnxS phase increased with increasing Mn dopant concentration. For the Zn0.68Mn0.32S nanoparticles, there was evidence for appearance of cluster spin-glasslike behavior, as indicated by two maxima around 15 and 25 K in temperature dependence of ac susceptibility. The frequency independence of the peak at higher temperature is related to the intracluster ferromagnetic (FM) interactions, and the frequency dependence of the peak at lower temperature is associated with the spin glass. All the results revealed that the concentration of Mn2+ in Mn–ZnS and the amount of Mn3O4 were crucial for the cluster spin-glass behavior, which was not found when the real concentration (x) was unequal to 0.20 in Zn1−xMnxS.

Sign in / Sign up

Export Citation Format

Share Document