The main aim of this paper is development of new conceptions about the general theory of structure phase transitions, phase diagrams, properties and effects in magnetic semiconductors.
An analysis of change of resistivity, magnetostrition, phase transitions of magnetic semiconductors: polycristalline La_0.7Mn_1.3O₃ and monocrystalline LaMnO₃ under influence of temperature (T), magnetic field (H) and hydrostatic pressure (P) was carried out. The revealed magneto-, baro- and baromagnetoresistive effects have shown the same temperature T_PP of their peaks which coincides with the temperature T_ms of structural phase transition 'metal-semiconductor' and the discovered 'cooling' and 'heating' effects allow us to substantiate the linear shifting of T_ms(H), T_ms(P) and H_g(T) [1]. A correspondence in the influence of T-H-P (8 K~2.12 kOe~1 kbar) on resistive properties, and T-H (5.2 K~2.5 kOe) on magnetostrictive properties has been established. Sign alternation change in properties, effects and priorities of the competing influence of thermo-, baro- and magnetoelastic anisotropically deforming (EAD) strictions has been fixed. Positions of critical lines T_ms(H), T_ms(P), H_g(T) and critical points T_X, P_X, PP_X, P_X', T_PP=T_ms, T_C have been determined (fig.1). Correspondence on resistivity and magnetostriction behaviours is shown [1].
Reference
[1] P.I. Polyakov, S.S. Kucherenko, JMMM 248, ?3, pp.396-401 (2002); Pisma v Zhurn. Teh. Fiz. 28, p.8 (2002); Fiz. Nizk. Temp. 28, ?10, pp.1041-1047 (2002).

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1. Regularities of elastically anisotropy deformed mechanism of T-H-P influence on the phase transition and properties change in magnetic dielectrics