Colossal Magnetoresistance

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Presentation transcript:

Colossal Magnetoresistance . Superconductivity Colossal Magnetoresistance Magnetism Functional oxides Multiferroicity Photoconductivity 1

Physics of interfaces

. LaAlO3 SrTiO3 3

Insulator + Insulator = Metal LaAlO3/SrTiO3 interface LAO and STO are band-gap insulators. . Insulator + Insulator = Metal 4

Comparison between different interfaces Sample Thin Film Thickness (uc) PO2 (mbar) T (C ͦ) 14-43 c-AlO\STO 4 1x10-4 600 14-52 550 14-73 3x10-2 700 Sample Thin Film Thickness (uc) PO2 (mbar) T (C ͦ) 14-40 c-LGO\STO 50 3x10-2 700 14-53 10 14-54

Field Effect experiment Current generator-238 I+ I- I-238 V+ V- V-182 LaAlO3 SrTiO3 Gate Vg Sample Thin Film Thickness (uc) PO2 (mbar) T (C ͦ) 13-59 c-LAO\STO (110) 10 1x10-3 700 A Picoammeter-6487

Field Effect experiment c-LAO\STO (110)

Photoconductivity Eg = ~3.2 eV