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- W1557229044 abstract "Using neutron scattering, we investigate the effect of a magnetic field on the static and dynamic spin response in heavily underdoped superconducting ${text{YBa}}_{2}{text{Cu}}_{3}{text{O}}_{6+x}$ $({text{YBCO}}_{6+x})$ with $x=0.33$ $({T}_{c}=8text{ }text{K})$ and 0.35 $({T}_{c}=18text{ }text{K})$. In contrast to the heavily doped and superconducting monolayer cuprates, the elastic central peak characterizing static spin correlations does not respond observably to a magnetic field which suppresses superconductivity. Instead, we find a magnetic-field-induced resonant enhancement of the spin fluctuations. The energy scale of the enhanced fluctuations matches the Zeeman energy within both the normal and vortex phases, while the momentum dependence is the same as the zero-field bilayer response. The magnitude of the enhancement is very similar in both phases with a fractional intensity change of $(I/{I}_{0}ensuremath{-}1)ensuremath{sim}0.1$. We suggest that the enhancement is not directly correlated with superconductivity but is the result of almost free spins located near hole-rich regions." @default.
- W1557229044 created "2016-06-24" @default.
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- W1557229044 date "2009-05-14" @default.
- W1557229044 modified "2023-09-25" @default.
- W1557229044 title "Magnetic field resonantly enhanced free spins in heavily underdopedYBa2Cu3O6+x" @default.
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- W1557229044 doi "https://doi.org/10.1103/physrevb.79.184514" @default.
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