Oxide Heterostructure

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Presentation transcript:

Oxide Heterostructure Shuhua Liang UTK Physics Dept.

Perovskite Stucture ABO3

LCMO (magnetic material) La0.67Ca0.33MnO3

High Tc Superconductor Lattice LSCO (High Tc Sc) (La1-xSrxCuO3 )

YBCO High Tc Sc YBa2Cu3O7-x CuO2 Plane More layers Higher Tc Distance Carriers in CuO2 Plane

Metallic Interfaces between Insulators LaTiO3 layers (bright) of varying thickness spaced by 5 layers of SrTiO3

LaTiO3 La 3+ one more e Ti 3+ Mott insulator A=0.397nm SrTiO3 Sr 2+ Ti 4+ Band insulator A=0.391nm

Charge leakage the Ti3+ signal is considerably wider than that of the La “Ti3+”~extra electron The ‘tail’ of Ti3+ have a decay length of 1nm as an order of screening length!

Metallic Structure Fraction of Ti3+ is a function of the number of LaTiO3 unit cells. Conductivity is a function of the thickness of LaTi3 and SrTi3

CMR Colossal magnetoresistance

LaMnO3

Double-exchange mechanism Ca 2+ cause electron free to move.

Oxide heterostructure interface

Ferromagnetic/Sc oxide interface Sc: YBa2Cu3O7-x FM: La0.67Ca0.33MnO3

interface

Electrons transfer

Thank you!