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Univ. Paris-Saclay
Shedding New Light on High-Tc Electronic Structure: From Top Down
Department of Physics, Boston College
Lundi 28/10/2013, 11:00-12:30
SPEC Bât 466 p.111 (1er ét.), CEA-Saclay

invité par Fabien SILLY


High-Tc superconductivity in cuprates remains a central intellectual issue in condensed matter physics 27 years after its initial discovery. The primary current concern of the field is about the relationship triangle between the pseudogap, superconductivity and possible density wave correlations that coexist and likely compete with superconductivity. Its complete resolution has been conceived to be a path that has to be taken toward the ultimate revelation of the mechanism of high-Tc superconductivity. On the other hand, our current understanding of both the high-Tc mechanism and the pseudogap is entirely based on a simplified description of the electronic band structure of cuprates, the so-called Zhang-Rice singlet description, whose validity was supported by experiments mostly performed in the early 90's and ought to be scrutinized by means of more powerful advanced techniques on refined materials that are only available in recent years.

In this talk, I will first briefly go through our recent progresses on the pseudogap issue, an aspect of electronic structure of direct, high-level relevance to the high-Tc mechanism. The progresses contribute to the establishment of the broken-symmetry nature of the pseudogap phase, which contains rich physics beyond the mere superconducting fluctuations as previously thought and directly implicate some density wave fluctuations. Then I will present our new finding about the Zhang-Rice singlet issue, a more fundamental aspect of the electronic structure. We observed electronic states of distinct symmetry coexisting with the Zhang-Rice singlets in the ground state of a cuprate family. This finding highlights the complexity of the high-Tc electronic infrastructure that was previously overlooked but might turn out to be crucial for a realistic, complete understanding of high-Tc superconductivity.

Contact : Cindy ROUNTREE


Séminaire SPCSI - Informations pratiques

Entrée sur le site du CEA de Saclay pour les séminaires SPCSI

Afin de pouvoir entrer sur le site du CEA de Saclay veuillez adresser les données personnelles suivantes par courriel à Christine Prigian et Catherine Julien (secrétariat) un avis d’entrée vous sera alors délivré:






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Ces informations doivent être envoyées au mieux deux jours avant la date du séminaire.

Lors de votre venue vous devez vous présenter avec une carte d'identité ou un passeport en cours de validité. L'entrée sur le site se fait par l'entrée principale ou porte Nord (suivre le lien ci-dessous), un badge vous y sera remis. Demandez à l'accueil le Bât.466, ils vous renseigneront.
Les séminaires se déroulent au Bât. 466, pièce 111 (1er étage).
En cas de problème vous pouvez contacter le secrétariat au : 01 69 08 65 32 /  40 12.

Formalities for entering the CEA Saclay site for SPCSI seminars



To enter in CEA Saclay you need to send the following personal data to Christine  PRIGIAN and Catherine Julien (secretariat):



Informations utiles/Practical informations - Contact

Informations:  Access


Contact: Christine Prigian et Catherine Julien


Last Name :

First Name :

Place and date of birth :

Nationality :

Employer Name :

These informations must be preferably sent at least two days before the seminar date.


When you come you must have a valid ID card or passport with you.

The entrance in CEA Saclay is through the main entrance or north entrance (see link below), a pass will be delivered. Ask at the “accueil” the path for the building 466. SPCSI seminars take place in room 111 (first floor).

Any questions/troubles do not hesitate to contact our secretariat : 33 (0)1 69 08 65 32 /  40 12.

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