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|Title: ||Hidden magnetic excitation in the pseudogap phase of a high-T-c superconductor|
|Authors: ||Li, Y|
|Keywords: ||Copper Oxides|
Temperature Range 0400-1000 k
|Issue Date: ||11-Nov-2010|
|Publisher: ||Natural Publishing Group|
|Citation: ||Li, Y., Baledent, V., Yu, G., Barisic, N., Hradil, K., Mole, R.A., Sidis, Y., Steffens, P., Zhao, X., Bourges, P., Greven, M. (2010). Hidden magnetic excitation in the pseudogap phase of a high-T-c superconductor. Nature, 468(7321), 283-285. doi:10.1038/nature09477|
|Abstract: ||The elucidation of the pseudogap phenomenon of the high-transition-temperature (high-T-c) copper oxides-a set of anomalous physical properties below the characteristic temperature T* and above T-c-has been a major challenge in condensed matter physics for the past two decades(1). Following initial indications of broken time-reversal symmetry in photoemission experiments(2), 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(5). Here we report inelastic neutron scattering results for HgBa2CuO4+delta 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(6). Its energy of 52-56 meV renders it a new candidate for the hitherto unexplained ubiquitous electron-boson coupling features observed in spectroscopic studies(7-10). © 2011, Nature Publishing Group|
|Appears in Collections:||Journal Articles|
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