The temperature and magnetic field dependences of electrical resistivity ρ(Т, Н) and magnetization m(Т, H) of the semiconductor solid solution (Pb_0.4Sn_0.6)_0.8In_0.2Te were studied in the temperature range T = 2 K - 300 K (including the region of the superconducting transition of the compound T ≤ 4 K) and in magnetic fields H ≤ 140 kOe. The critical parameters of superconducting transition were determined: the critical temperature T_c ≈ 4 K and the second critical magnetic field at T → 0 K, H_c2(0) ≈ 27.5 kOe. The magnetic field - magnetization dependences m(H) at T < T_c region exhibit a hysteresis loop associated with the magnetic flux capturing by a polycrystalline superconducting sample. In magnetic fields close to the second critical H_c2(T) at temperatures T < 3 K, an additional maximum of the diamagnetic response on the forward branch and a symmetric paramagnetic maximum on the reverse branch were observed on the m(H) dependences, which we interpret as the peak-effect in magnetization of the superconducting solid solution. In the (Pb_0.4Sn_0.6)_0.8In_0.2Te sample, at the temperature Т = 2 K and the peak-effect field Н_peak = 16.5 kOe, the magnetization peak amplitude was ~ 6% of the maximum value of the Meissner response at H ≈ 0 Oe. On the basis of the obtained data the possible nature of the peak-effect in the magnetization of solid solutions (Pb_zSn_1-z)_1-хIn_хTe, at Т < T_c was discussed, influence of the vortex structure dynamics of the superconducting compound, the lead content in the solid solution, the level of In doping and external parameters was considered.

研究了在T  = 2 K-300的温度范围内半导体固溶体（Pb _0.4 Sn _0.6）_0.8 In _0.2 Te的电阻率ρ（Т，Н）和磁化强度m（Т，H）的温度和磁场依赖性K（包括该化合物的超导转变的区域Ť  ≤4 K）和在磁场ħ  ≤140千奥斯特。测定超导转变的临界参数：临界温度T _{c ^} ≈4 K和第二临界磁场在T→0 K，H _C2（0）≈27.5千奥斯特。T <T _c时的磁场-磁化强度依赖性m（H）该区域表现出与多晶超导样品捕获的磁通量相关的磁滞回线。在温度T <3 K处接近第二临界H _c2（T）的磁场中，根据m（H）依赖性，观察到正向分支上的反磁响应的附加最大值和反向分支上的对称顺磁最大值，我们将其解释为超导固溶体磁化的峰值效应。在铅（Pb _0.4锡_0.6）_0.8在_0.2碲样品，在温度Т= 2 K和峰值效应场Н_峰 = 16.5千奥斯特，磁化峰值幅度是在迈斯纳响应的最大值的〜6％ħ  ≈0奥斯特。对所得到的数据的以固体溶液的磁化的峰值效应可能性质的基础（铅_Ž的Sn _1-Z ）_1-х在_х碲，在Т<T _Ç讨论，涡流结构动力学的影响考虑了超导化合物的组成，固溶体中的铅含量，In掺杂水平和外部参数。