From the resonance properties of monocrystalline low-temperature magnetic dielectric CuCl₂*2H₂O a correspondence of T-H-P influence (1 K~4 kOe~3 kbar) on structural phase transition has been determined [2]. The thermomagnetic and thermobaromagnetic effects are revealed [3]. Their peaks have the same temperature T_PP=0 K, which coincides with the temperature T_ST of structural phase transition, by analogue with magnetic semiconductors [1]. An sign alternation 'cooling' and 'heating' effects in T_P(H), T_P (H,P) shifting are also found. The critical points P_X, PP_X, T_X and P have the temperature parameter T_P=9.2 K which is highly different from the known T_N=4.3 K in these materials.
From the various established critical lines T_P(H), H_g(T) and points P_X, PP_X, T_X the value of correspondence and sign alternation of T-H-P influence through the EAD mechanism is defined. The identical of this mechanism in magnetic semiconductors and magnetic dielectrics is proposed.
Presented results allow to predict the participation of EAD mechanisms in realization of well-known collosal magnetoresistive effect and of superconductivity effect on HTSC structures.
Using of these mechanisms allow to rename the law of correspondence states as the law of elastically deformed correspondence, and revealed regularities of T-H-P influence as the law of elastically anisotropy deformed stresses and sign alternation.
References
[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).
[2] A.A. Galkin, V.A. Popov, P.I. Polyakov et.al. Fiz. Nizk. Temp. 2, ?1, pp.49-60 (1976); Fiz. Tverd. Tel. 17, ?10, pp. 2123-2126 (1975);
[3] P.I. Polyakov, S.S. Kucherenko Proceeding of NMMM-18, Mosc. State Univer., Mosc., p.714, 2002.
[4] J.Van Den Handel, H.M. Gijsman and N.J. Poulis, Phisica, 1952, v.18, ?11, p.8

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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 semiconductors