Electronic Structure of Charge- and Spin-Controlled Sr1-(x+y)Lax+yTi1- xCrxO3
PhysRevLett_96_067203.pdf 269 KB
charge transfer states
We present the electronic structure of Sr1-(x+y)Lax+yTi1-xCrxO3 investigated by high-resolution photoemission spectroscopy. In the vicinity of the Fermi level, it was found that the electronic structure was composed of a Cr 3d local state with the t2g3 configuration and a Ti 3d itinerant state. The energy levels of these Cr and Ti 3d states are well interpreted by the difference of the charge-transfer energy of both ions. The spectral weight of the Cr 3d state is completely proportional to the spin concentration x irrespective of the carrier concentration y, indicating that the spin density can be controlled by x as desired. In contrast, the spectral weight of the Ti 3d state is not proportional to y, depending on the amount of Cr doping.
Physical Review Letters
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American Physical Society
Copyright (c) 2006 The American Physical Society.
Graduate School of Science
Hiroshima Synchrotron Radiation Center