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Multi-band Conduction Behaviour at the Interface of LaAlO3/SrTiO3 Heterostructures
Veerendra K. Guduru,A. McCollam,J. C. Maan,U. Zeitler,S. Wenderich,M. K. Kruize,A. Brinkman,M. Huijben,G. Koster,D. H. A. Blank,G. Rijnders,H. Hilgenkamp 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We have measured the Hall resistance and magneto-resistance (MR) of LaAlO3/SrTiO3 heterojunctionsat magnetic fields up to 30 T in a temperature range T = 4 K to 70 K. For temperaturebelow 7 K and above 50 K the devices display linear Hall resistance, indicating that one typeof charge carriers dominate the transport. For temperatures between 10 K and 40 K, the Hallresistance is strongly non-linear, and is accompanied by a large positive MR, which is governedby the component of magnetic field normal to the interface. This behaviour in the intermediatetemperature regime can be related to thermally activated high-mobility carriers.