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• W2023961094 abstract "Abstract We present various oxygen-isotope effects in the manganites from magnetization and thermal-expansion measurements. We found that the ferromagnetic transition temperature T c , the magnitude of the jump in the thermal-expansion coefficient Δβ (T c ) at T c all depend strongly on the oxygen mass. Upon replacing 16 O with 18 O, T c can be lowered by as much as 20 K, and Δβ (T c ) can be raised by about 20%. The observed novel isotope effects clearly demonstrate that charge carriers in these materials are strongly coupled to the local Jahn-Teller distortions, so that polarons are formed. We also report the experimental evidence for polaronic supercarriers in the cuprate superconductors La 2− x Sr x CuO 4 . From magnetization and thermal-expansion measurements, we can quantitatively determine the oxygen-isotope effects on the in-plane penetration depth λ ab (0) and on the carrier density n . We find a negligible isotope effect on n , but a large effect on λ ab (0). Our results show that polaronic charge carriers exist and condense into Cooper pairs in the cuprate superconductors." @default.
• W2023961094 created "2016-06-24" @default.
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• W2023961094 date "1997-08-01" @default.
• W2023961094 modified "2023-10-14" @default.
• W2023961094 title "Oxygen isotope effects in the manganites and cuprates: Evidence for polaronic charge carriers" @default.
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• W2023961094 doi "https://doi.org/10.1016/s0921-4534(97)00198-6" @default.
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