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Zeitschriftenartikel:

Y. Li, V. Baledent, G. Yu, N. Barisic, K. Hradil, R. Mole, Y. Sidis, P. Steffens, X. Zhao, P. Bourges, M. Greven:
"Hidden magnetic excitation in thepseudogap phase of a model cuprate superconductor";
Nature, 468 (2010), 7321; S. 283 - 285.



Kurzfassung englisch:
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 decades1. Following initial indications of broken time-reversal symmetry in photoemission experiments2, 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 point5. 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 parameter6. Its energy of 52-56 meV renders it a new candidate for the hitherto unexplained ubiquitous electron-boson coupling features observed in spectroscopic studies7, 8, 9, 10.


"Offizielle" elektronische Version der Publikation (entsprechend ihrem Digital Object Identifier - DOI)
http://dx.doi.org/10.1038/nature09477


Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.