Physics – Condensed Matter – Materials Science
Scientific paper
2002-03-12
Jour. Phys.: Cond. Mat. 14 (2002) 3951
Physics
Condensed Matter
Materials Science
11 pages, 6 figures. to be published in Journal Physics: Condensed Matter
Scientific paper
10.1088/0953-8984/14/15/309
Strained thin films of charge/orbital ordered (CO/OO) $Nd_{0.5}Ca_{0.5}MnO_3$ (NCMO) with various thickness have grown on (100)-SrTiO$_3$ and (100)-LaAlO$_3$ substrates, by using the Pulsed Laser Deposition (PLD) technique. The thickness of the films influences drastically the transport properties. As the thickness decreases, the CO transition increases while at the same time the insulator-to-metal transition temperature decreases under application of a 7T magnetic field. Clear relationships between the structural distortions and the transport properties are established. They are explained on the basis of the elongation and the compression of the Mn-O-Mn and Mn-O bond angles and distances of the \QTR{it}{Pnma} structure, which modify the bandwidth and the Jahn-Teller distortion in these materials
Buzin Rauwel E.
Mercey Bernard
Prellier Wilfrid
Raveau Bernard
Simon Ch.
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