Skip to Main content Skip to Navigation
Theses

Paramètre d'ordre magnétique dans la phase de pseudogap des oxydes de cuivre supraconducteurs à haute température critique

Abstract : This work presents a new magnetic order in the pseudo-gap phase of superconducting cuprates. The study of the three families YBa2Cu3O6+δ, HgBa2CuO4+δ and La1.92Sr0.08CuO4 reveals a magnetic order parameter developping under the temperature of the opening pseudo-gap. For the first time, we report the existence of collective modes associated to this order in the system HgBa2CuO4+δ. All the results converge to the conclusion that the pseudo-gap is linked to a true phase transition, with an order parameter and a symmetry breaking : the time reversal symmetry. It is worth noticing that the translation symmetry of the lattice is preserved, so that this order can be qualified as Q=0 order. Moreover, our study of incommensurate spin fluctuations near the antiferromagnetic wave vector (QAF) has enabled us to demonstrate the underlying competition between two magnetic instabilities : the Q=0 order and the QAF spin fluctuations in both YBa2Cu3O6+δ, and La1.92Sr0.08CuO4 . All these results could be a key toward the understanding of the puzzling high TC superconductivity.
Complete list of metadatas

https://tel.archives-ouvertes.fr/tel-00683440
Contributor : Victor Balédent <>
Submitted on : Wednesday, March 28, 2012 - 5:05:53 PM
Last modification on : Monday, February 10, 2020 - 6:12:13 PM
Long-term archiving on: : Friday, June 29, 2012 - 2:27:25 AM

Identifiers

  • HAL Id : tel-00683440, version 1

Citation

Victor Balédent. Paramètre d'ordre magnétique dans la phase de pseudogap des oxydes de cuivre supraconducteurs à haute température critique. Electrons fortement corrélés [cond-mat.str-el]. Université Paris Sud - Paris XI, 2010. Français. ⟨tel-00683440⟩

Share

Metrics

Record views

453

Files downloads

845