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- W2001982502 abstract "We have investigated the effect of temperature and 10 kbar pressure on the structure of the new high-temperature superconductor Y2Ba4Cu7O15 (Tc=68 K) in an attempt to relate the pressure dependence of Tc in such materials to changes in certain Cu-O distances. The orthorhombic Ammm X-ray model of Bordet et al., with lattice constant c≈50.3 Å, has been confirmed by our high-resolution neutron powder diffraction measurements. The structure can be described as alternate layers of single CuO-chain (YBa2Cu3O7) and double CuO-chain (YBa2Cu4O8) blocks. The thermal expansion is anisotropic, with the b-axis, parallel to the single and double Cu-O chains, remaining approximately constant for T<Tc. As in YBa2Cu4O8, Cu-O distances bridging chains and planes, as well as Ba-O distancesare significantly changed by pressure. However, in Y2Ba4Cu7O15 these changes are different for the single and double CuO-chain layers. A correlation with the pressure dependence of Tc is proposed." @default.
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- W2001982502 date "1990-05-01" @default.
- W2001982502 modified "2023-10-16" @default.
- W2001982502 title "High resolution neutron powder diffraction investigation of temperature and pressure effects on the structure of the high-Tc superconductor Y2Ba4Cu7O15" @default.
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- W2001982502 doi "https://doi.org/10.1016/0921-4534(90)90677-7" @default.
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