Ferromagnetism is found in the CdGeAs:Mn systems. These are heterogeneous magnets, they consist of a ferromagnetic and superparamagnetic phases. Portion of first phase increases with a level of doping. An origin of ferromagnetism in CdGeAs 2 :Mn is connected with the existence of vacancies (Cd, V C , Mn)GeAs 2 or non-stoichiometric (Cd, Ge, Mn)GeAs 2 , as only in this case the ferromagnetic state is more advantageous than a spin glass-like state on theoretical estimations. MnAs or related compounds were found in them by accurate X-ray measurements. A magnetization was determined using SQUID magnetometer and a paramagnetic susceptibility by a weight method with an electromagnetic compensation. An electrical resistivity was measured by a four-probe method. Figure 1 gives the specific magnetization M in the magnetic field H = 50 kOe as a function of temperature T of all the samples investigated in this paper. Figure 2 shows the M(T) curves of sample CdGeAs 2 with 3 mass%
Although distributed fiber-optic sensing of axial strain and temperature is a well-established technique, there are almost no demonstrations of distributed hydrostatic pressure sensing. The main obstacle for such measurements is the low sensitivity to pressure of standard optical fibers. Structured fibers, such as photonic crystal fibers, can be made pressure sensitive by means of an optimized arrangement of their internal microstructure. In this paper, we demonstrate-for the first time to our knowledge-distributed birefringence and hydrostatic pressure measurements based on phase-sensitive optical time-domain reflectometry (OTDR) in highly birefringent photonic crystal fibers. We study the response to hydrostatic pressure of two dedicated pressure-sensitive photonic crystal fibers in the range from ∼0.8 to ∼67 bar with a 5-cm spatial resolution using a phase-OTDR approach. We find differential pressure sensitivities between the slow and fast polarization axes of the studied fibers of-219 MHz/bar and 95.4 MHz/bar. These values are ∼3.8 to ∼8.8 times larger than those demonstrated previously in distributed pressure measurements with other photonic crystal fibers.
The optical absorption, photoconductivity, and short-circuit photocurrent spectra of structurally perfect Cd 1x Zn x As 2 ( x = 0.03, 0.05, 0.06) single crystals are studied for the first time near the intrinsic edge in the range 80-300 K. The results demonstrate that the intrinsic edge in the solid solutions is due to indirect transitions involving the formation of excitons for both the E || c and E ⊥ c polarizations. The indirect gaps of the solid solutions are determined. In the range 80-300 K, the data for x = 0-0.06 and both polarizations are well fitted by ( x ) = (0) + 0.0866 x + 2.35 x 2 . The introduction of 6 mol % ZnAs 2 into CdAs 2 increases its by Ӎ 14 meV.
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