Spin Susceptibility in Underdoped YBa2Cu3O6+x
Abstract
We report a comprehensive polarized and unpolarized neutron scattering study of the evolution of the dynamical spin susceptibility with temperature and doping in three underdoped single crystals of the 6+x high temperature superconductor: 6.5 (Tc = 52 K), 6.7 (Tc = 67 K), and 6.85 (Tc = 87 K). Theoretical implications of these data are discussed, and a critique of recent attempts to relate the spin excitations to the thermodynamics of high temperature superconductors is given.
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