Low Temperature magnetic studies

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Staff of Research Group

Desnenko V. A.  e-mail:desnenko@ilt.kharkov.ua	Head of group Candidates of Sciences (Ph.D.),  Senior Research Fellow.
Fedorchenko A. V.	Candidates of Sciences (Ph.D.),  Junior Research Fellow.
Ushakova N. V.	Engineer

Main directions of studies

• Investigations of magnetic properties and effects related to phase transitions in HighTc, GMR and CMR oxides.

• Studies of static magnetic properties of anisotropic systems with magnetic rare-earth and transition metal ions, being in paramagnetic and/or magnetically ordered state.

• Investigations of structural defects with magnetic methods.

Main principal results, recently obtained

Studies of non-collinear magnetic structures.

Identification of magnetic field induced structural phase transitions in manganese oxides.

Detection of giant diamagnetic peculiarities in orbital susceptibility of metals and intermetallic compounds under electronic topological transitions in band structure.

Experimental equipment 

SQUID magnetometer  for magnetization and magnetic susceptibility measurements that operates at temperatures 4.2 – 300 K, fields 0 –  5 T.

Main publications of last years

Beznosov A. B., Belevtsev B. I., Fertman E. L., and Desnenko V. A., Naugle D. G., Rathnayaka K. D. D., and Parasiris A. Exchange interaction and magnetoresistance in La_2/3Ca_1/3MnO₃ : experiment and models. Fiz. Nizk. Temp., 28 , N 7, 774-780 (2002)

Beznosov A. B., Eremenko V. V., Fertman E. L., Desnenko V. A., Khalyavin D. D.
Magnetic phases in La_0.66Ba_0.34MnO₃: effects of temperature and elastic 
deformations. Fiz. Nizk. Temp., 28 , N10, 1065-1071(2002). 

Kharchenko N. F., Desnenko V. A., Kharchenko Yu. N., Szymczak R., and 
Baran M. Nonmonotonous temperature dependence of the spontaneous magnetic moment 
of the antiferromagnetic crystal LiCoPO₄. Fiz. Nizk. Temp., 28, N8-9, 896-904 (2002).

Beznosov A. B., Desnenko V. A., Fertman E. L., Ritter C., and Khalyavin D. D.
Magnetic and neutron diffraction study of La_2/3Ba_1/3MnO₃ perovskite manganite. Physical Review. B., 68 , N5, 0541091-05410911 (2003).

Fertman E., Ritter C., Beznosov A., Desnenko V., Khalyavin D. Crystallographic Phases in La_2/3Ba_1/3MnO₃: Temperature Transformations and Relation to Magnetism. Physica. Sect.B., 350, N1-3, 227-230 (2004).

Fertman E., Sheptyakov D., Beznosov A., Desnenko V., Khalyavin D. Exchange Interactions and Magnetic Subsystem in Nd_2/3Ca_1/3MnO₃: Analysis of Temperature Effects. Physica. Sect.B., 350 , N 1-3, E9-E12 (2004).

V.A. Desnenko, S.N. Dolya, N.V. Isaev, I.V. Svechkarev, and A.V. Fedorchenko, Anomalous diamagnetism in aluminium-lithium alloys, Fiz. Nizk. Temp., 30, N5, 568 (2004).

Fertman E., Sheptyakov D., Beznosov A., Desnenko V., Khalyavin D. Magnetic states and the crystal volume of Nd_2/3Ca_1/3MnO₃: analysis of phase transformations. Journal Magnetism and Magnetic Materials, 293, N2, 787-792 (2005).

E.L. Fertman, A.B. Beznosov, V.A. Desnenko, L.N. Pal-Val, P.P. Pal-Val, D.D. Khalyavin. Singularities of magnetic and elastic characteristics of La_2/3Ba_1/3MnO₃: Analysis of martensitic kinetics. Journal Magnetism and Magnetic Materials, 308, N2, 278-283 (2007).

A.B. Beznosov, E.L. Fertman, and V.A. Desnenko. Charge ordering, intrinsic structure parameters and magnetic susceptibility of Nd_2/3Ca_1/3MnO₃:driving forces of the phase transition. Low Temp. Phys. 34, N8, 790-797 (2008)