Effect of phase stratification into electro- and magnetotransport in heteroepitaxial La2/3Ca1/3MnO3 films


Cite item

Full Text

Open Access Open Access
Restricted Access Access granted
Restricted Access Subscription Access

Abstract

The La2/3Ca1/3MnO3 films 25-nm thick biaxially compressed in the substrate plane, grown quasi-coherently on the (001) surface of the LaAlO3 single crystal, were studied using laser vaporization. It was found that mechanical stresses acting during nucleation and growth promoted calcium enrichment of the cation sublattice of the manganite layer, which caused a decrease in its unit cell volume. Crystalline grains in manganite films were distinctly oriented along the normal to the substrate plane; the grain size in the substrate plane was within 20–40 nm, and the relative grain misorientation in the substrate plane did not exceed 0.2°. In zero magnetic field, the maximum in the temperature dependence of the resistivity ρ of La2/3Ca1/3MnO3 films was observed at temperatures close to 210 K. At T < 100 K and μ0H = 2 T, the magnetoresistance of manganite films was negative, weakly depended on temperature, its value was about–0.45. The magnetic field caused transformation of nonferromagnetic phase inclusions to ferromagnetic ones, which resulted in a decrease in the La2/3Ca1/3MnO3 film resistivity with increasing magnetic field. At low temperatures (T < 100 K), a hysteresis was observed in the dependences of the film resistivity on the magnetic field.

About the authors

Yu. A. Boikov

Ioffe Physical-Technical Institute

Author for correspondence.
Email: yu.boikov@mail.ioffe.ru
Russian Federation, ul. Politekhnicheskaya 26, St.Petersburg, 194021

M. P. Volkov

Ioffe Physical-Technical Institute; International Laboratory of High Magnetic Fields and Low Temperatures in Wroclaw

Email: yu.boikov@mail.ioffe.ru
Russian Federation, ul. Politekhnicheskaya 26, St.Petersburg, 194021; Warsaw

Supplementary files

Supplementary Files
Action
1. JATS XML

Copyright (c) 2016 Pleiades Publishing, Ltd.