Nature of the enigmatic pseudogap state: novel magnetic order in superconducting HgBa2CuO4+d

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dc.creatorLi, Yuan
dc.creatorBalédent, Victor
dc.creatorBarisic, Neven
dc.creatorCho, Yongchan
dc.creatorFauqué, Benoit
dc.creatorSidis, Yvan
dc.creatorYu, Guichuan
dc.creatorZhao, Xudong
dc.creatorBourges, Philippe
dc.creatorGreven, Martin
dc.date2008-05-19
dc.date.accessioned2026-07-07T10:03:55Z
dc.date.available2026-07-07T10:03:55Z
dc.descriptionThe nature of the enigmatic pseudogap region of the phase diagram is the most important and intriguing unsolved puzzle in the field of high transition-temperature (Tc) superconductivity. This region, the temperature range above Tc and below a characteristic temperature T*, is characterized by highly anomalous magnetic, charge transport, thermodynamic and optical properties. Associated with the pseudogap puzzle are open questions pertaining to the number of distinct phases and the presence of a quantum-critical point underneath the superconducting dome. Here we use polarized neutron diffraction to demonstrate for the model superconductor HgBa2CuO4+d (Hg1201) that T* marks the onset of an unusual magnetic order, and hence a novel state of matter with broken time-reversal symmetry. Together with prior results for YBa2Cu3O6+d (YBCO), this observation constitutes an essential and decisive demonstration of the universal existence of such a state. The new findings appear to rule out a large class of theories that regard T* as a crossover temperature rather than a phase transition temperature. Instead, they are consistent with a variant of previously proposed charge-current-loop order that involves apical oxygen orbitals, and with the notion that many of the unusual properties arise from the presence of a quantum-critical point.
dc.description6 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0805.2959
dc.identifierhttp://arxiv.org/abs/0805.2959
dc.identifierNature 455, 372 (2008)
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/169472
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleNature of the enigmatic pseudogap state: novel magnetic order in superconducting HgBa2CuO4+d
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