Atomic Order and the Interaction of Electronic and Magnetic Subsystems in Epitaxial LaSr(Ca)MnO Films

• Authors: V. Okunev , Z. Samoilenko , T. D'yachenko , A. Abal'oshev , M. Baran , P. Gierłowski , S. Lewandowski , A. Szewczyk , R. Szymczak
• Languages of publication: EN

Abstracts

EN

We have investigated the structure, and electric, optical, and magnetic properties of LaSr(Ca)MnO films containing atomic clusters of various types coherently built into the basic crystallographic matrix. Below the transition to the metallic state, the electrical conductivity of the films is determined by tunneling of charge carriers between metallic clusters. We have found that for each sample there exists a threshold value of magnetic ordering, above which the magnetic subsystem starts to affect actively the film conductivity. The observed increase of conductivity with decreasing temperature is caused by the fact that in the process of magnetic ordering of the samples the cluster size and concentration of metallic phase increase. Experimental results are in agreement with theoretical calculations.

Keywords

EN

75.30.Kz; 75.47.Lx; 61.50.Ks

Discipline

• 61.50.Ks: Crystallographic aspects of phase transformations; pressure effects(see also 81.30.Hd in materials science)
• 75.47.Lx: Magnetic oxides
• 75.30.Kz: Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)(for ferroelectric phase transitions, see 77.80.B-; for superconductivity phase diagrams, see 74.25.Dw)

• Journal: Acta Physica Polonica A
• Year: 2004
• Volume: 105
• Issue: 1-2
• Pages: 121-126

Dates

published

2004-01/02

received

2003-09-15

Contributors

author

V. Okunev

• A. Galkin Donetsk Institute for Physics & Technology, National Academy of Sciences of Ukraine, Donetsk, Ukraine

author

Z. Samoilenko

• A. Galkin Donetsk Institute for Physics & Technology, National Academy of Sciences of Ukraine, Donetsk, Ukraine

author

T. D'yachenko

• A. Galkin Donetsk Institute for Physics & Technology, National Academy of Sciences of Ukraine, Donetsk, Ukraine

author

A. Abal'oshev

• Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland

author

M. Baran

• Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland

author

P. Gierłowski

• Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland

author

S. Lewandowski

• Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland

author

A. Szewczyk

• Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland

author

R. Szymczak

• Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland

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Identifiers

DOI

10.12693/APhysPolA.105.121