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The Jahn-Teller effect in the charge-ordered (CO) state for La1-xCaxMnO3(0.5<x<0.87) was studied by measuring the low-temperature powder x-raydiffraction, internal friction, and shear modulus. We find that theelectron-lattice interaction with the static Jahn-Teller distortion is thestrongest near x=0.75 in the CO state. It was particularly observed that acrossover of the Jahn-Teller vibration mode from Q2 to Q3 near x=0.75 inducescrossovers of the crystal structure from tetragonally compressed totetragonally elongated orthorhombic, and of the magnetic structure from CE-typeto C-type near x=0.75. The experimental results give strong evidence that theJahn-Teller effect not only plays a key role in stabilizing the CO state, butalso determines the magnetic and crystal structures in the CO state forLa1-xCaxMnO3.Comment: 13 pages, 3 figures, PD

Internal friction and Jahn–Teller effect in the charge-ordered La1−xCaxMnO3 (0.5⩽x⩽0.87)