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

Piter I. Polyakov ,  Stanislav S. Kucherenko 

National Academy of Sciences of Ukraine, Donetsk Technical-Physical Institute, R. Luxemburg 72, Donetsk 83114, Ukraine

Abstract

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 TPP=0 K, which coincides with the temperature TST of structural phase transition, by analogue with magnetic semiconductors [1]. An sign alternation 'cooling' and 'heating' effects in TP(H), TP (H,P) shifting are also found. The critical points PX, PPX, TX and P have the temperature parameter TP=9.2 K which is highly different from the known TN=4.3 K in these materials.
From the various established critical lines TP(H), Hg(T) and points PX, PPX, TX 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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Presentation: poster at E-MRS Fall Meeting 2003, Symposium D, by Stanislav S. Kucherenko
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-04-16 15:34
Revised:   2009-06-08 12:55