Synthesis and magnetic properties of Mn-doped Cd_0.1Zn_0.9GeAs₂solid solutions

Abstract

Homogeneous crystals of diluted magnetic semiconductor solid solution Zn 0.9 Cd 0.1 GeAs 2 doped with 0, 1.13 and 2.65 mass% of Mn were synthesized. The grown crystals were characterized by atomic absorption and synchrotron x-ray powder diffraction analyses showing that the lattice parameter of the sample crystals are closely related to GaAs. Measurements of magnetic and transport properties were performed in the temperature range of 4-400 K using steady and pulsed magnetic fields up to B = 50 and 150 kG, respectively. The ferromagnetic Curie temperature of the sample crystals was found to be about 350 K. The magnetic ordering is attributed to the presence of MnAs clusters with mean size ∼3.8 nm in the ferromagnetic phase. Influence of paramagnetic Mn 2+ ions on magnetic properties of the crystals was observed only at low temperatures and was explained by the p-d interaction between charge-carrying holes and localized Mn moments.

Phase diagram of the ZnSnAs2–MnAs system

“…In same time, we found, that such structure can't be prepared based on any representative of A II B IV C V 2 semiconductors. For example we found, that ZnGeAs 2 and Zn 0.9 Cd 0.1 GeAs 2 doped with MnAs has negative magnetoresistance (MR), but CdGeAs 2 +MnAs has positive MR [13,14,28]. Moreover, these structures have different Curie point (from 355 up to 367 K for CdGeAs 2 and ZnGeAs 2 respectively [12]), regardless the magnetic properties of these structures define the same MnAs compound.…”

“…In our previous works we studied granular systems based on host semiconductors A II B IV C V 2 (ZnGeAs 2 , CdGeAs 2 and ZnSiAs 2 ) with nanosized inclusions of MnAs [10, 12,28]. Such structures are promising materials for spintronics applications.…”

Growth and magnetic properties of Mn‐doped ZnSiAs2/Si heterostructures

“…Growth and postgrowth annealing at temperatures above 200 °C lead to phase separation into clusters of the thermodynamically more stable MnAs phase embedded in the host matrix [12]. In this case, the magnetic properties of the samples were substantially governed by the presence of MnAs clusters, as observed in II-V [13], III-V [12,14], and II-IV-V2 [8] diluted magnetic semiconductors. When analyzing the magnetic properties of the samples, it is necessary to take into account that the Curie temperature of MnAs depends not only on the value of the applied magnetic field, but also on the measurement mode.…”

(Cuinse2)1-X (Tase)X Solid Solutions (0 < X ≤ 0.5): X-Ray Diffraction, Scanning Electron Microscopy, Differential Thermal Analysis and Magnetic Susceptibility

“…perature ferromagnetism (RT-FM) in the analogous A II -B IV -C V 2 compounds doped with transition metals (TM) [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] has prompted a new and renewed interest in his research. Particularly, the magnetism of CuInSe 2 doped and/or alloyed with Mn, Fe and Ta has been reported before [18,19,23,24] founding paramagnetic, superparamagnetic and spinglass behaviors (Table 1).…”