Spiral Spin State in High-Temperature Copper-Oxide Superconductors: Evidence from Neutron Scattering Measurements
Per-Anker Lindgård
DOI 10.1103/PhysRevLett.95.217001 · Physical Review Letters
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Abstract
An effective spiral spin phase ground state provides a new paradigm for the high-temperature superconducting cuprates. It accounts for the recent neutron scattering observations of spin excitations regarding both the energy dispersion and the intensities, including the “universal“ rotation by 45° around the resonance energy Eres. The intensity has a 2D character even in a single twin crystal. The value of Eres is related to the nesting properties of the Fermi surface. The excitations above Eres are shown to be due to in-plane spin fluctuations, a testable difference from the stripe model. The form of the exchange interaction function reveals the effects of the Fermi surface, and the unique shape predicts large quantum spin fluctuations in the ground state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-x(Sr,Ba)xCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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