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- Title
Hidden magnetic excitation in the pseudogap phase of a high-T<sub>c</sub> superconductor.
- Authors
Yuan Li; Balédent, V.; Yu, G.; Barišić, N.; Hradil, K.; Mole, R. A.; Sidis, Y.; Steffens, P.; Zhao, X.; Bourges, P.; Greven, M.
- Abstract
The elucidation of the pseudogap phenomenon of the high-transition-temperature (high-Tc) copper oxides-a set of anomalous physical properties below the characteristic temperature T* and above Tc-has been a major challenge in condensed matter physics for the past two decades. Following initial indications of broken time-reversal symmetry in photoemission experiments, recent polarized neutron diffraction work demonstrated the universal existence of an unusual magnetic order below T* (refs 3, 4). These findings have the profound implication that the pseudogap regime constitutes a genuine new phase of matter rather than a mere crossover phenomenon. They are furthermore consistent with a particular type of order involving circulating orbital currents, and with the notion that the phase diagram is controlled by a quantum critical point. Here we report inelastic neutron scattering results for HgBa2CuO4+δ that reveal a fundamental collective magnetic mode associated with the unusual order, and which further support this picture. The mode's intensity rises below the same temperature T* and its dispersion is weak, as expected for an Ising-like order parameter. Its energy of 52-56 meV renders it a new candidate for the hitherto unexplained ubiquitous electron-boson coupling features observed in spectroscopic studies.
- Subjects
COPPER oxide superconductors; HIGH temperature superconductivity; MAGNETIC properties of superconductors; PHOTOEMISSION; NEUTRON diffraction
- Publication
Nature, 2010, Vol 468, Issue 7321, p283
- ISSN
0028-0836
- Publication type
Article
- DOI
10.1038/nature09477