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18.09.2008

Nature 455, 372-375 (18 September 2008) | doi:10.1038/nature07251; Received 14 May 2008; Accepted 2 July 2008



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


Y. Li1, V. Balédent2, N. Baris caronic acute3,4, Y. Cho3,5, B. Fauqué2, Y. Sidis2, G. Yu1, X. Zhao3,6, P. Bourges2 & M. Greven3,7




  1. Department of Physics, Stanford University, Stanford, California 94305, USA
  2. Laboratoire Léon Brillouin, CEA-CNRS, CEA-Saclay, 91191 Gif sur Yvette, France
  3. Stanford Synchrotron Radiation Laboratory, Stanford, California 94309, USA
  4. 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
  5. BK21 Team of Nano Fusion Technology, Pusan National University, Busan 609-735, Korea
  6. State Key Lab of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
  7. Department of Applied Physics, Stanford University, Stanford, California 94305, USA


Correspondence to: M. Greven3,7 Correspondence and requests for materials should be addressed to M.G. (Email: greven@stanford.edu).





The pseudogap region of the phase diagram is an important unsolved puzzle in the field of high-transition-temperature (high-T c) superconductivity, characterized by anomalous physical properties1, 2. There are open questions about the number of distinct phases and the possible presence of a quantum-critical point underneath the superconducting dome3, 4, 5. The picture has remained unclear because there has not been conclusive evidence for a new type of order. Neutron scattering measurements for YBa2Cu3O6+delta (YBCO) resulted in contradictory claims of no6, 7 and weak8, 9 magnetic order, and the interpretation of muon spin relaxation measurements on YBCO10, 11 and of circularly polarized photoemission experiments on Bi2Sr2CaCu2O8+delta(refs 12, 13) has been controversial. Here we use polarized neutron diffraction to demonstrate for the model superconductor HgBa2CuO4+delta (Hg1201) that the characteristic temperature T* marks the onset of an unusual magnetic order. Together with recent results for YBCO14, 15, this observation constitutes a demonstration of the universal existence of such a state. The findings appear to rule out theories that regard T* as a crossover temperature16, 17, 18 rather than a phase transition temperature19, 20, 21. Instead, they are consistent with a variant of previously proposed charge-current-loop order19, 20 that involves apical oxygen orbitals22, and with the notion that many of the unusual properties arise from the presence of a quantum-critical point3, 4, 5, 19.



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А Б В Г Д Е Ё Ж З И Й К Л М Н О П Р С Т У Ф Х Ц Ч Ш Щ Ъ Ы Ь Э Ю Я
  • Chen Wev .  honorary member of ISSC science council

  • Harton Vladislav Vadim  honorary member of ISSC science council

  • Lichtenstain Alexandr Iosif  honorary member of ISSC science council

  • Novikov Dimirtii Leonid  honorary member of ISSC science council

  • Yakushev Mikhail Vasilii  honorary member of ISSC science council

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