The Synthesis and Investigation of the Electrical Properties of Tricadmium Diarsenide with MnAs Nanogranules

Saipulaeva, L. A.; Gadzhialiev, M. M.; Pirmagomedov, Z. Sh.; Efendieva, T. N.; Alibekov, A. G.; Abdulvagidov, Sh. B.; Melnikova, N. V.; Zakhvalinskii, V. S.; Маренкин, С. Ф.

doi:10.1134/s1063784220070178

Cited by 3 publications

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“…2), it is characterized by a metallic type of conductivity at temperatures below critical tempera- ture T cg = 241 K of cluster glass formation (the maximum point on the curve) and by a semiconducting (thermoactivated) type of conductivity above this temperature. This kind of behavior of the electrical resistivity is consistent with the SEM image of a cleaved surface of the studied sample [12], which shows that the sample is a eutectic alloy of MnAs nanoclusters that are hardly in contact with one another and embedded in a Cd 3 As 2 semiconductor matrix. If there were any significant percolation conductivity of the Cd 3 As 2 phase, then the metallic type of conductivity would be observed for MnAs up to the Curie temperature at 325 K. As seen from Fig.…”

Section: Resultssupporting

confidence: 87%

“…The microstructure of the sample indicates the eutectic segregation of the melt upon solidification into a system of the following two substances: Cd 3 As 2 and MnAs. Moreover, the latter is present in the form of spherical granules, which may indicate that such a segregation took place even in the melt [12].…”

Section: Resultsmentioning

confidence: 99%

“…This morphology leads to an uneven distribution of the electric field in the sample volume. An electron microscopic study of Cd 48.6 Mn 11.4 As 40 made it possible to establish that the size of MnAs nanoclusters varies in the range of 10-50 nm [12]. Typically, the charac-teristic diameter of MnAs nanoclusters is in the range of 20-30 nm.…”

Section: Resultsmentioning

confidence: 99%

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Spin-Polarized Electric Current in Cd48.6Mn11.4As40 Nanocomposite

et al. 2021

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For the first time, the temperature dependences of the electrical resistivity and magnetization of the Cd 48.6 Mn 11.4 As 40 nanocomposite were measured in the temperature range of 10-350 K. It is shown that the electrical properties of Cd 48.6 Mn 11.4 As 40 are associated with spin polarization of intrinsic electrons in the Cd 3 As 2 matrix by spin-polarized electrons injected into it from ferromagnetic MnAs nanoclusters. With an increase in the magnetization of the entire sample, the angle between the magnetization directions of individual nanoclusters decreases and the spin-polarized current increases. Furthermore, an increase in the concentration of intrinsic carriers in the matrix leads to an increase in the spin-polarized current. This concept is also confirmed by measurements of current-voltage characteristics (CVCs) at voltages of up to 5 V at temperatures both below critical temperature T cg = 241 K of cluster glass formation (at 77 and 172 K) and above it (at 273.15 and 373.15 K), which exhibit an increasing deviation from the ohmic behavior with an increase in the stress. This means that the greater the spin polarization of intrinsic electrons in Cd 3 As 2 due to an increase in the injection of spin-polarized electrons from MnAs with an increase in the voltage, the higher the current.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%