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Comptes Rendus Physique
Volume 12, n° 5-6
pages 461-479 (juin 2011)
Doi : 10.1016/j.crhy.2011.04.006
Novel magnetic order in the pseudogap state of high-  copper oxides superconductors
Ordre magnétique de lʼétat pseudogap des oxydes de cuivre supraconducteurs à haute température critique
 

Philippe Bourges , Yvan Sidis
Laboratoire Léon-Brillouin-Orphée, CEA-Saclay, 91191 Gif-sur-Yvette, France 

Corresponding author.
Abstract

One of the leading issues in high-  copper oxide superconductors is the origin of the pseudogap phase in the underdoped regime of their phase diagram. Using polarized neutron diffraction, a novel magnetic order has been identified as an hidden order parameter of the pseudogap as the transition temperature corresponds to what is expected for the pseudogap. The observed magnetic order preserves translational symmetry as predicted for orbital moments in the circulating current theory. Being now reported in three different cuprates families, it appears as a universal phenomenon whatever the crystal structure (with single CuO2 layer or bilayer per unit cell). To date, it is the first direct evidence of a hidden order parameter characterizing the pseudogap phase of high-  cuprates.

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Résumé

Un des problèmes majeurs des oxydes de cuivre supraconducteurs à haute température critique est lʼorigine de la phase pseudogap dans lʼétat sous-dopé. En utilisant des mesures de diffraction de neutrons polarisés, nous avons identifié un ordre magnétique caché qui apparaît à la température attendue de cet état de pseudogap. Cet ordre magnétique respecte la symétrie de translation du réseau comme cela a été prédit dans la théorie des boucles de courants circulants. Nous avons généralisé cette découverte dans trois familles distinctes de cuprates. Cette mesure est la première preuve expérimentale directe dʼun paramètre dʼordre universel de lʼétat de pseudogap des oxydes de cuivre supraconducteurs.

The full text of this article is available in PDF format.

Keywords : Neutron diffraction, High-  superconductors, Pseudogap phase

Mots-clés : Diffraction de neutron, Supraconducteurs à haute température critique, Phase de pseudogap




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