Coupling between Orbital and Lattice Degrees of Freedom in Y1-xCaxTiO3 (0< or =0.75)

We have studied the orbitally ordered states in Y1-xCaxTiO3 (04p transition energy (main-edge) gradually decrease with increasing x and remain finite even in the metallic phase for x>0.4. In contrast, the intensities at the 1s->3d transition energy (pre-edge) decrease rapidly with increasing x...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2005-12, Vol.74 (12), p.3259
Main Authors: Tsubota, Masami, Iga, Fumitoshi, Uchihira, Kazuyuki, Nakano, Toshihiro, Kura, Soichiro, Takabatake, Toshiro, Kodama, Soukichi, Nakao, Hironori, Murakami, Youichi
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Language:English
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Summary:We have studied the orbitally ordered states in Y1-xCaxTiO3 (04p transition energy (main-edge) gradually decrease with increasing x and remain finite even in the metallic phase for x>0.4. In contrast, the intensities at the 1s->3d transition energy (pre-edge) decrease rapidly with increasing x up to 0.15 and disappear at x∼0.4. The x dependences of the Jahn-Teller distortion is consistent with those of the RXS intensities at pre-edge. Namely, the RXS intensity at the pre-edge energy reflects the orbital ordered state. From our results, we conclude that the magnetic order in Y1-xCaxTiO3 becomes unstable at x∼0.15 when the orbital order is weakened, and the metallic phase appears in x>0.4 when the order of orbitals melts.
ISSN:0031-9015
1347-4073