Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-03-04
Physics
Condensed Matter
Strongly Correlated Electrons
26 pages, 8 figures. To be published in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.70.014408
The effects of the cooperative Jahn-Teller effect on the crystal structure and the stability of the charge ordered (CO) state were studied by measurements of powder X-ray diffraction, resistivity, and ultrasound for Pr1-xCaxMnO3 (0.5<=x<=0.875). Powder X-ray diffraction revealed a change of the crystal structure from tetragonally compressed to tetragonally elongated orthorhombic between x=0.75 and x=0.8 in the CO state, resulting from the crossover of the cooperative Jahn-Teller vibration mode from Q2 to Q3. The relative stiffening of the ultrasound (DeltaV/V) reflecting the magnitude of the cooperative Jahn-Teller lattice distortion in the CO state increases with increasing x from 0.5 to 0.625, reaching the largest and being almost x-independence for 0.625
Li Gaojun
Li Xiang-Gui
Qian Tiezheng
Tang Nu A.
Wang Wenhong
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