Slow Relaxation of Resistance in Manganite Perovskite Nanoconstrictions

• Authors: J. Baszyński
• Languages of publication: EN

Abstracts

EN

The time decay of the surface resistance R_{S}(t) was measured for the La_{0.7}Sr_{0.3}MnO_{3} perovskite nanocontacts obtained by break technique at liquid nitrogen. The corresponding time relaxation can be described by two-term formula: stretched exponential function and logarithmic dependence. The characteristic times τ_{1} and τ_{2} of the relaxation processes are of order of seconds and few tens of seconds, respectively. The appearance of both contributions evidences the existence of two sources of relaxation, which can be assigned to inhomogeneous changes of the angle between the magnetic moments of the neighboring Mn ions inside spin blocks (τ_{1}) and between the spin blocks (τ_{2}) occurring near surface of the nano-electrodes. Similar to magnetic viscosity, the dependence of resistance viscosity S_{R} on basis current is characterized by bell-shaped curve. These results point out the important role of the structural arrangements of the Mn-ions into spin blocks on the surfaces electrodes of the nanocontact.

Keywords

EN

75.60.Lr; 75.50.Pp

Discipline

• 75.60.Lr: Magnetic aftereffects
• 75.50.Pp: Magnetic semiconductors

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2009
• Volume: 115
• Issue: 1
• Pages: 339-341

Dates

published

2009-01

Contributors

author

J. Baszyński

• Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland

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Identifiers

DOI

10.12693/APhysPolA.115.339