. .. Dépendance, , p.125

.. .. Discussion,

. .. Questions-en-suspens,

, Résurgence du magnétisme de LSCO jusqu'à p * en champs magnétiques intenses, p.133

. .. , 134 6.1.2 Mode transverse (c 11 ? c 12 )/2 dans l'échantillon désordonné LSCO15, Émergence du verre AF sous champ magnétique à p 0.148, p.140

*. .. ,

.. .. Résumé-de-la-dépendance-en-dopage-de-?v/v,

.. .. Discussion,

. .. Questions-en-suspens,

. Ordre and . .. De-phase, 172 7.2.1 Signatures de l'ODC 3D dans la vitesse du son

. .. Susceptibilité-en-déformation-de-t-c,

, Questions en suspens Ce chapitre a permis une ré-interprétation des données ultrasonores dans LSCO, mais soulève également un grand nombres de questions associées : 1. Quelle est l'origine microscopique des anomalies ultrasonores ? 2. Quelle est l'origine l, vol.12, p.0

, Quelle est l'origine de l'eet du champ pour B > B c2 dans les échantillons supraconducteurs ?

, L'ordre de charge joue-t-il un rôle dans la vitesse du son mesurée ? Est-il responsable pour le ramollissement précurseur au gel des uctuations de spins ?

, Quelle est l'origine de la (faible) diérence de température de gel mesurée en RMN et ultrasons ?

, Est-il possible de reproduire la dépendance non monotone de T min (B) dans le cadre d'un modèle de Landau avec deux paramètres d'ordres ?

, Une thèse est une aventure humaine. Pendant ces 3 années David Le B÷uf m'a fait découvrir avec enthousiasme et passion le monde de la recherche, Remerciements J'aimerais tout d'abord remercier Yann Gallais et Joerg Schmalian qui ont accepté d'être rapporteurs de cette thèse. Merci également à Thierry Klein

, Il m'a oert l'opportunité de participer à de nombreuses conférences, de découvrir le milieu scientique international, et même de participer à des projets annexes à ma thèse. Ces trois années ont donc été très enrichissantes professionnellement et humainement

. Marc-henri, Du côté scientique, le projet de mesure en champs intenses sur LSCO, une collaboration entre le groupe ultrasons et celui de RMN, a été au c÷ur du projet de thèse. Il a toujours été disponible pour me coacher sur une présentation, m'aider à trouver n'importe quel papier de l'immense bibliographie des cuprates, ou encore répondre à mes interrogations, aussi bien sur la physique que sur le ski ! Je garde un très bon souvenir de la (matinale) sortie ski au pic, Julien a également été très important tout au long de cette thèse, très (très) loin d'un simple rôle "administratif, 2018.

, Hadrien Mayare a toujours été enclin à m'aider avec les présentations (à commencer par celle de l'école doctorale pour obtenir le nancement de thèse), le moindre problème technique, et m'a même initié à ma première mesure de RMN (seulement du tuning, mais ça compte quand même !). L'aide technique et les discussions avec Steen Krämer, Plus généralement travailler de concert avec l'équipe de RMN a été un vrai plaisir

, Au sein de l'équipe RMN il y a l'inclassable Igor. Ça a été un immense plaisir de vivre cette thèse avec Igor dans le même bureau. Nos (longues) discussions quotidiennes ont grandement contribué à

E. Vincent, R. Yildiz, R. Pankow, and . Barbier, Julien Jousset et Cédric Grandclément sur le site de Grenoble. Merci à eux et à l'ensemble des équipes techniques ! Durant cette thèse j'ai également eu l'aide importante de Jérôme Debray pour orienter et couper les échantillons de LSCO, une tâche souvent fastidieuse

, Je tiens à remercier Indranil Paul pour les discussions concernant le couplage entre paramètres d'ordre et déformation, et ses explications sur les mécanismes microscopiques du couplage électron-phonon. Nicolas Laorencie a également apporté son aide dans la compréhension de l, L'analyse des données ultrasonores est une tâche complexe

. L'ambiance-À-toulouse-et-grenoble-aurait-Été-bien-diérente-sans-la-présence-de-armelle, A. Leonid, and B. Diana, Kévin et beaucoup d'autres. À la prochaine ! Finalement pendant ces trois années j'ai pu compter sur le soutien de ma famille que je remercie, et sur les deux dernières de Inna

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, des oxydes de cuivre, une supraconductivité non conventionnelle, connée entre isolant de Mott et liquide de Fermi corrélé

. Au-delà-de-la-supraconductivité, Une connaissance profonde de ce diagramme de phase est une étape nécessaire à la résolution de l'énigme de la supraconductivité des cuprates. Pour cela on propose ici une étude de la vitesse et de l'atténuation du son

, La première (et principale) partie de cette thèse s'intéresse au magnétisme de La 2?x Sr x CuO 4

, Dans ce composé un verre antiferromagnétique est en forte compétition avec la supraconductivité. L'établissement de signatures ultrasonores associées à cet ordre a permis une étude en champs magnétiques pulsés, jusqu'à ? 90 T, qui indique qu'alors il persiste jusqu'à un dopage qui semble coïncider avec celui de la disparition du pseudogap, p * . L'existence de moments magnétiques quasistatiques en champs magnétiques intenses suggère que les signatures de criticalités quantiques, mais également la chute du nombre de Hall, observées dans certains cuprates dans des conditions similaires

, Dans une courte seconde partie, on s'intéresse aux deux ordres de charges

, Une étude systématique en dopage de la vitesse du son dans Y-123 restreint le domaine d'existence de l'ordre de charge 3D et indique que ce dernier est peu probablement à l'origine de la reconstruction de la surface de Fermi observée dans ce composé. La susceptibilité à une déformation élastique de la température critique supraconductrice, dT c /d i , obtenue également par vitesse du son, interroge quant à elle sur la possibilité d'un scénario dans lequel sa dépendance en dopage -complexe et anisotrope -s'explique, une problématique distincte mais reliée à la précédente