Relations between structural distortions and transport properties in Nd₀.₅Ca₀.₅MnO₃ strained thin films

الأصل · EN

Strained thin films of charge/orbital ordered (CO/OO) Nd₀.₅Ca₀.₅MnO₃ (NCMO) with various thickness have grown on (100)-SrTiO₃ and (100)-LaAlO₃ 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 itPnma structure, which modify the bandwidth and the Jahn-Teller distortion in these materials