Abstract
Inelastic neutron-scattering measurements have been performed on underdoped where superconductivity and long-range antiferromagnetic (AFM) order coexist. The magnetic spectrum found in the normal state is strongly damped and develops into a magnetic resonance feature below that has appreciable dispersion along axis with a bandwidth of 3–4 meV. This is in contrast to the optimally doped composition, with no long-range AFM order, where the resonance exhibits a much weaker dispersion. [see M. D. Lumsden et al., Phys. Rev. Lett. 102, 107005 (2009).] The results suggest that the resonance dispersion arises from interlayer spin correlations present in the AFM ordered state.
- Received 18 February 2010
DOI:https://doi.org/10.1103/PhysRevB.81.140510
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