Magnetoresistance of La0.67Sr0.33MnO3 epitaxial films grown on a substrate with low lattice mismatch
Artikel i vetenskaplig tidskrift, 2005

The structure, electrical resistivity, and magnetoresistance of La0.67Sr0.33MnO3 heteroepitaxial films (120-nm thick) practically unstrained by lattice mismatch with the substrate were studied. A strong maximum of negative magnetoresistance of approximate to 27% (for mu(0)H = 4 T) was observed at T approximate to 360 K. While the magnetoresistance decreased monotonically in magnitude with decreasing temperature, it was still in excess of 2% at 150 K. For T < 250 K, the temperature dependence of the electrical resistivity rho of La0.67Sr0.33MnO3 films is fitted well by the relation rho = rho(0) + rho(1)(H)T (2.3), where rho(0) = 1.1 x 10(-4) Omega cm, rho(1)(H = 0) = 1.8 x 10(-9) Omega cm/K-2.3, and rho(1)(mu(0)H = 4 T)/rho(1)(H = 0) approximate to 0.96. The temperature dependence of a parameter gamma characterizing the extent to which the electrical resistivity of the ferromagnetic phase of La0.67Sr0.33MnO3 films is suppressed by a magnetic field (mu(0)H = 5 T) was determined. (c) 2005 Pleiades Publishing, Inc.

exchange

behavior

la0.67ca0.33mno3 films

magnetic-field

strain

resistivity

transport

Författare

Y. A. Boikov

Tord Claeson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

V. A. Danilov

Physics of the Solid State

1063-7834 (ISSN) 1090-6460 (eISSN)

Vol. 47 2281-2286

Ämneskategorier

Den kondenserade materiens fysik