Unusual magnetic order in the pseudogap region of the superconductor HgBa2CuO4+δ

Y. Li, V. Balédent, N. Barišić, Y. Cho, B. Fauqué, Y. Sidis, G. Yu, X. Zhao, P. Bourges and M. Greven ()
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Y. Li: Stanford University, Stanford, California 94305, USA
V. Balédent: Laboratoire Léon Brillouin, CEA-CNRS, CEA-Saclay, 91191 Gif sur Yvette, France
N. Barišić: Stanford Synchrotron Radiation Laboratory, Stanford, California 94309, USA
Y. Cho: Stanford Synchrotron Radiation Laboratory, Stanford, California 94309, USA
B. Fauqué: Laboratoire Léon Brillouin, CEA-CNRS, CEA-Saclay, 91191 Gif sur Yvette, France
Y. Sidis: Laboratoire Léon Brillouin, CEA-CNRS, CEA-Saclay, 91191 Gif sur Yvette, France
G. Yu: Stanford University, Stanford, California 94305, USA
X. Zhao: Stanford Synchrotron Radiation Laboratory, Stanford, California 94309, USA
P. Bourges: Laboratoire Léon Brillouin, CEA-CNRS, CEA-Saclay, 91191 Gif sur Yvette, France
M. Greven: Stanford Synchrotron Radiation Laboratory, Stanford, California 94309, USA

Nature, 2008, vol. 455, issue 7211, 372-375

Abstract: Pseudogaps: secret of superconductivity The pseudogap region of the phase diagram is an important unsolved puzzle in the field of high transition-temperature superconductivity. Li et al. report polarized neutron diffraction data that demonstrate that the characteristic temperature, T*, marks the onset of an unusual magnetic order, and hence a novel state of matter with broken time-reversal symmetry, for the model superconductor HgBa2CuO4+δ (Hg1201). The findings appear to rule out theories that regard T* as a crossover temperature rather than a phase transition temperature. Instead, they are consistent with the notion that many of the unusual properties arise from the presence of a quantum-critical point.

Date: 2008
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DOI: 10.1038/nature07251

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