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- W2000325259 abstract "Attenuation and velocity of 7 MHz longitudinal ultrasound in polycrystalline ceramic La 2−x Ba x CuO 4−δ and La 2−x Ba x CuO 4−δ have been measured in the temperature range from 300 K to 1.5 K. On cooling a pronounced softening of the lattice is observed for 0.09 ≤ × ≤ 0.20 just above the transition temperature T dl from the tetragonal phase to the orthorhombic phase. A large attenuation peak is observed at T dl . The further low-temperature transformation from the orthorhombic phase to the tetragonal low-temperature phase is observed, with partial lattice stiffening and a small attenuation peak at T d2 , not only in La 2−x Ba x CuO 4−δ but also in La 2−x Sr x CuO 4−δ The mechanism of the unusual T C reduction around x = 0.12 is proposed on the basis of the distortion of CuO 2 basal planes from a square to a rhombus below T d2 ." @default.
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- W2000325259 date "1990-08-01" @default.
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- W2000325259 title "Ultrasonic studies of structural phase transitions and superconductivity in La2−xBaxCuO4−δ and La2−xSrxCuO4−δ" @default.
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- W2000325259 doi "https://doi.org/10.1016/s0921-4526(09)80230-5" @default.
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