Research Article

Incommensurate Spin Fluctuations in High-Transition Temperature Superconductors

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Science  22 Aug 1997:
Vol. 277, Issue 5329, pp. 1067-1071
DOI: 10.1126/science.277.5329.1067

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Abstract

Neutron scattering experiments have revealed a fascinating interplay between the hole doping, the spin fluctuations, and the superconductivity of the cuprate superconductors. Recently, electrochemical techniques have been used to produce large single crystals of La2CuO4+ y, which has mobile oxygen dopants. Staging behavior of the excess oxygen has been demonstrated, and the low-energy spin fluctuations in stage 6 La2CuO4+ y have been measured. The spin fluctuations are incommensurate with the lattice and have spatial, energy, and temperature dependencies very much like those in La2− xSrxCuO4, with similar high transition temperature. This establishes the universality of the incommensurate spin fluctuations among the La2CuO4-based superconductors.

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